NIH Study Finds Association Between Elevated Phthalate Levels and Increased Risk of Postpartum Depression

Posted on September 21, 2023August 27, 2025 by Jodi Snare

FOR IMMEDIATE RELEASE

In a new study from the NIH’s Environmental influences on Child Health Outcomes (ECHO) Program, higher prenatal phthalate levels were associated with a slightly increased risk of postpartum depression.

Postpartum depression affects up to 20% of new mothers, making it the most common pregnancy complication to occur after delivery. ECHO Cohort researchers wanted to examine how chemicals such as phenols, phthalates, and parabens—commonly found in plastics and personal care products—might play a role in postpartum depression symptoms, alongside other factors like genetics and stress. Exposure to these chemicals can affect hormone levels, potentially influencing the development of postpartum depression.

The presence of these man-made chemicals in people is common due to frequent exposure through diet, absorption through the skin, and inhalation. Researchers noted that among study participants all had parabens and nearly all had phthalates in their urine samples.

“Finding new ways to prevent postpartum depression is crucial because most of the known risk factors, like genetics and stressful life events, can’t be altered,” said Melanie Jacobson, PhD, MPH of New York University’s Grossman School of Medicine. “Therefore, focusing on prenatal exposure to these types of chemicals represents a novel interventional target.”

Researchers measured the concentrations of these chemicals in urine samples of 2,174 pregnant individuals at five ECHO Cohort Study Sites. Those same individuals also completed depression assessments between two weeks and 12 months after delivery to check for postpartum depression symptoms. Screening instruments indicated the presence or absence of postnatal depressive symptoms. Researchers then harmonized data to the Patient-Reported Measurement Information System (PROMIS) Depression scale.

The study found that higher levels of phthalates, in particular those found in products such as personal care items and plastic consumer products, were associated with an increased risk of postpartum depression. Those who met the criteria for postpartum depression were more likely to be Hispanic and from the ECHO study site in Puerto Rico, have attained less education, and substantially higher prenatal depression scores.

This collaborative research, which is believed to be the largest study to date examining the effects of environmental chemicals on depression, is published in JAMA Psychiatry.

Jacobson, M. et al. Prenatal exposure to nonpersistent environmental chemicals and postpartum depression. JAMA Psychiatry. DOI: 10.1001/jamapsychiatry.2023.3542.

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New ECHO Research Finds Association Between Some Prenatal Chemical Exposures and Postpartum Depression

Posted on September 21, 2023September 21, 2023 by Jodi Snare

Collaborative ECHO research led by Melanie Jacobson, PhD, MPH of the NYU Grossman School of Medicine, investigates the role of prenatal synthetic chemicals in postpartum depression. This research, titled “Prenatal Exposure to Nonpersistent Environmental Chemicals and Postpartum Depression,” is published in JAMA Psychiatry.

Postpartum depression affects up to 20% of new mothers, making it the most common pregnancy complication to occur after delivery. Postpartum depression can impact a mother’s daily functioning, quality of life, and long-term health. Furthermore, it is associated with poor mother-child attachment, which can impact child health and development.

Factors like genetics and stress can make some people more likely to experience postpartum depression, but researchers are still trying to understand how synthetic chemicals might also play a role. Chemicals such as phenols, phthalates, and parabens can be found in plastics and personal care products. While these chemicals are nonpersistent, meaning that they don’t linger in the environment, their presence is widespread due to frequent exposure through diet, absorption through skin, and inhalation.

Researchers used data from 2,174 pregnant individuals across five study sites to examine the extent to which exposure to these chemicals might be associated with postpartum depression symptoms. They measured the concentrations of nonpersistent chemicals in urine samples during pregnancy and collected data using self-reported postnatal depression assessments after delivery completed by the same individuals.

The study found that prenatal phthalate concentrations were associated with increased odds of slightly higher postpartum depression scores. Of the many synthetic chemicals investigated, only phthalate concentrations were associated with increased odds of postpartum depression. This suggests that finding ways to reduce prenatal exposure to phthalates might reduce the frequency of postpartum depression. Researchers also observed that postpartum depression was more likely in people who were Hispanic, had lower educational attainment, and had prenatal depression.

“From a public health perspective, any way to help prevent postpartum depression would be important, since most known risk factors such as genetics, psychiatric history, and stressful life events, cannot be easily changed,” Dr. Jacobson said. “Therefore, focusing on prenatal exposure to these types of chemicals represents a novel interventional target.”

While this is believed to be the largest study to date examining the effects of environmental chemicals on postpartum depression, future studies are needed to replicate this research with larger sample sizes in diverse populations.

Read the research summary.

ECHO Researchers Characterize Children Born Preterm into Four Neurobehavioral Profiles

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ECHO Researchers Characterize Children Born Preterm into Four Neurobehavioral Profiles

Authors: Marie Camerota, et al.

Who sponsored this study?

The Environmental influences on Child Health Outcomes (ECHO) Program, Office of the Director, National Institutes of Health supported this research.

Why was the study needed?

Birth outcomes for infants born very preterm have steadily improved over the past several decades. More children born at earlier gestational ages are surviving into childhood, however, it is unclear how being born very preterm may influence neurodevelopmental or behavioral problems.

Outcomes of children born at a gestational age of less than 33 weeks (“very pre-term”) vary significantly, with some children showing few neurodevelopmental concerns and others showing significant impairment. Most prior research has looked at single outcomes—for example, whether a child born preterm had a lower neurodevelopmental score or higher levels of behavior problems. Understanding how these different outcomes may group together can help researchers and healthcare providers provide more comprehensive treatment plans for children born very preterm.

What were the study results?

Researchers found evidence for four different neurobehavioral profiles based on different combinations of cognitive, motor, and behavioral outcomes of children at the age of two. These profiles range from few or no developmental concerns to severe impairment in one or more domains. The study placed most children (about 85%) into one of two groups with no/mild developmental delay and a low prevalence of behavioral problems. The remaining 15% fell into one of two profiles with more serious neurodevelopmental problems with (5%) or without (10%) co-occurring behavior problems.

Footnote: Results reported here are for a single study. Other or future studies may provide new information or different results. You should not make changes to your health without first consulting your healthcare professional.

What was the study's impact?

This study helps researchers better understand outcomes for children following a very pre-term birth. The different groups of children this study described might require different types of follow-up services or interventions.

Who was involved?

This study included more than 2,000 babies who were born at less than 33 weeks gestational age and were evaluated at the age of two years. Pre-term children from three ECHO research sites in the U.S. were included in this analysis.

What happened during the study?

Researchers recruited children born less than 33 weeks gestational age into the ECHO Program shortly after they were born. When these children reached age two years, researchers conducted a neurodevelopmental assessment and a motor exam; parents completed questionnaires about their children’s behavior. ECHO researchers looked for patterns in these data to understand whether there were groups of children with similar strengths and weaknesses.

What happens next?

More research is needed to understand why some preterm children develop neurodevelopmental and/or behavioral problems and others do not. To do this, future studies may study risk factors in pregnancy, the perinatal period, and in early infancy.

Where can I learn more?

Access the full journal article, titled “Neurodevelopmental and behavioral outcomes of very preterm infants: latent profile analysis in the Environmental influences on Child Health Outcomes (ECHO) Program,” in Pediatric Research.

The content is the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Published September 12, 2023

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ECHO Researchers Characterize Children Born Preterm into Four Neurobehavioral Profiles

“Accelerated” Biological Age at Birth Not Linked to Behavioral and Emotional Health Outcomes in Early Childhood

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“Accelerated” Biological Age at Birth Not Linked to Behavioral and Emotional Health Outcomes in Early Childhood

Authors: Christine Ladd-Acosta, Heather Volk, et al.

Who sponsored this study?

The Environmental influences on Child Health Outcomes (ECHO) Program, Office of the Director, National Institutes of Health supported this research.

Why was the study needed?

Previous studies have shown that early identification and intervention in the development of emotional and behavioral health challenges in children seems connected to better long-term health outcomes. Recently, researchers have begun looking at how epigenetic factors affect children’s biological age and health outcomes.

A molecular process known as DNA methylation, or DNAm, adds a tag to DNA to control gene expression. Researchers measure DNAm to estimate a person’s biological age and compare it with their chronological age to better understand the factors that may influence their long-term health outcomes. In this study, ECHO researchers looked at the link between biological age at birth, the time between conception and birth (chronological gestational age), and emotional and behavioral health outcomes in children.

What were the study results?

Differences between biological age at birth and chronological gestational age did not appear linked to emotional and behavioral problems in childhood. This study did not find any difference between boys and girls in terms of the effect of “accelerated” biological age on behavioral and emotional outcomes.

Footnote: Results reported here are for a single study. Other or future studies may provide new information or different results. You should always consult with a qualified healthcare provider for diagnosis and for answers to your personal questions.

What was the study's impact?

These results highlight that because biological age at birth does not seem to predict emotional or behavioral health challenges in early childhood, research should investigate how other biological factors at birth may influence neurodevelopmental health outcomes in early childhood.

Who was involved?

The study included four ECHO research sites in the United States and a total of 592 children.

What happened during the study?

Researchers calculated each child’s “biological age” by analyzing DNA samples collected at birth, and they compared this age to the child’s chronological gestational age. They then tested whether newborns who showed increased biological age relative to their chronological age (“accelerated aging”) were more likely to have emotional and behavioral problems in early childhood.

What happens next?

Future research in a larger sample might confirm these findings. The relatively small sample size of this study may have made it difficult to observe differences in behavioral or emotional outcomes based on child sex. Future research with larger samples could help investigate potential differences in the results between boys and girls.

Where can I learn more?

Access the full journal article, titled “Accelerated epigenetic age at birth and child emotional and behavioral development in early childhood: a meta-analysis of four prospective cohort studies in ECHO,” in Epigenetics.

The content is the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Published September 10, 2023

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“Accelerated” Biological Age at Birth Not Linked to Behavioral and Emotional Health Outcomes in Early Childhood

New ECHO Research Observed Shortened Social Responsiveness Scale to be Comparable to Full Version in Autism Risk Factor Estimation

Posted on September 5, 2023September 25, 2023 by Jodi Snare

Collaborative ECHO research led by Marisa Patti, PhD and Kristen Lyall, ScD of AJ Drexel Autism Institute investigates how a shortened version of the Social Responsiveness Scale (SRS) compares to the full questionnaire in order to potentially decrease the time participants need to take assessments. This research, titled “A Comparative Analysis of the Full and Short Versions of the Social Responsiveness Scale in Estimating an Established Autism Risk Factor Association in ECHO: Do we Get the Same Estimates?” is published in the Journal of Autism and Developmental Disorders.

The SRS questionnaire is used to measure social communication and autism-related traits. Researchers have developed a shortened version with only 16 questions out of the original 65. This shortened version is intended to provide a similar summary of overall traits as the longer version, but take less time to complete.

The shorter SRS has been tested to ensure that it measures autism-related traits. Before this study, it was not clear if the short SRS could be used in the same way as the full SRS to study autism risk factors in different research projects and get similar results. In order to address whether the short version can detect associations in the same way as the full version, researchers examined associations with established risk factors for autism- preterm birth and gestational age.

In this study, which included 2,760 child-parent pairs from 11 research sites, younger gestational age and pre-term birth were associated with higher SRS scores, suggesting these may be risk factors for autism-related behaviors in children. The study also found similar associations using the shortened SRS, suggesting both the short and longer versions can detect autism risk factor associations in comparable ways.

Gathering meaningful information for research studies can be time-consuming for participants. This study suggests that shorter assessments can be as useful as longer ones to help reduce the time participants spend answering questionnaires.

“Studies like ours show that the same information can be collected using shorter, less time-consuming assessments to alleviate participant burden by reducing the administration time of assessments,” Dr. Patti said. “In future work, the short SRS can be used without compromising the ability of the assessment to correctly identify associations.”

Future research studies are needed to investigate how comparable estimates are between the full and short SRS using other established risk factors. Researchers may also consider using the short SRS in place of the full SRS in future studies to reduce the overall amount of time participants spend on a research study.

Read the research summary.

NIH Study Suggests Association Between Prenatal Depression and Greater Autism-related Traits in Children

Posted on August 1, 2023August 27, 2025 by Jodi Snare

FOR IMMEDIATE RELEASE

Children of mothers with prenatal depression had slightly more autism-related traits compared to those without that exposure, according to a study funded by the Environmental influences on Child Health Outcomes (ECHO) Program at the National Institutes of Health.

While this study didn’t explore why this association might exist, future research could investigate whether these findings reflect overlap in genetic risk for depression and autism-related traits or another mechanism.

Prior studies linked prenatal depression and depression history to autism spectrum disorder, but this study focused broadly on autism-related traits. By studying social communication and other autism-related traits, researchers can better understand how prenatal depression influences these traits, which may show up in children without an official diagnosis of autism spectrum disorder.

“Autism-related traits can significantly impact a child's physical, social, and psychological development, regardless of their clinical diagnosis. Screening and treating pregnant patients for depression and detecting autism-related traits in these children early on can lead to timely support of healthy development and outcomes for mothers and children,” said study author Lyndsay Avalos, PhD, MPH, of Kaiser Permanente Northern California Division of Research.

The analysis included 3,994 parent-child pairs with prenatal depression data and 1,730 pairs with depression severity data from 33 ECHO research sites across the United States. Autism-related traits were assessed using the Social Responsiveness Scale (SRS) for children up to 12 years of age.

Dr. Avalos and Lisa Croen, PhD, also of Kaiser Permanente Northern California Division of Research, led this collaborative research published in Autism Research.

###

About ECHO: Launched in 2016, the Environmental influences on Child Health Outcomes (ECHO) Program is a research program in the Office of the Director at the NIH with the mission to enhance the health of children for generations to come. ECHO investigators study the effects of a broad range of early environmental influences on child health and development. For more information, visit echochildren.org.

About the NIH: NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information, visit www.nih.gov.

Media Contacts

For information or to request an interview, contact Rebekah Yeager, rebekah.yeager@nih.gov.

If you are not a member of the media, but have a general inquiry, please contact NIHKidsandEnvironment@od.nih.gov.

Connect With Us

Check out the recent issues of our bi-monthly newsletter, the ECHO Connector, for program news and the latest research findings.

To receive the ECHO Connector through email, subscribe here.

Follow @ECHOChildHealth for the latest ECHO Program updates on Twitter.

New ECHO Research Suggests Link Between Prenatal Depression and Autism-related Traits

Posted on August 1, 2023November 22, 2023 by Jodi Snare

Collaborative ECHO research led by Lyndsay A. Avalos, PhD and Lisa A. Croen, PhD of Kaiser Permanente Northern California Division of Research investigates the potential link between prenatal depression or a history of depression prior to pregnancy and autism-related traits in children. This research, titled “Prenatal Depression and Risk of Child Autism-Related Traits Among Participants in the Environmental influences On Child Health Outcomes Program,” is published in Autism Research.

Previous research suggests an association between prenatal depression or a history of depression prior to pregnancy and autism spectrum disorder (ASD) in children, but most studies have focused on a formal ASD diagnosis, rather than autism-related traits.

This study examined parent-child pairs at 33 prenatal and pediatric research sites in the United States. The primary analysis included 3,994 parent-child pairs with prenatal depression diagnosis data; a secondary analysis included 1,730 parent-child pairs with depression severity data. Children of mothers with prenatal depression had slightly more autism-related traits compared to those without. The association was similar among boys and girls. Prenatal depression also increased the likelihood of moderate to severe autism-related traits, indicating a higher likelihood of ASD diagnosis.

“Autism-related traits can significantly impact a child’s physical, social, and psychological development, regardless of their clinical diagnosis. Screening and treating pregnant patients for depression and detecting autism-related traits in these children early on can lead to timely support of healthy development and outcomes for mothers and children,” said study author Dr. Avalos.

This study adds to the understanding of how prenatal depression may be associated with neurodevelopment in children, such as social communication and behavioral characteristics that may not reach a clinical threshold but can still impact a child’s social and behavioral functioning. These findings highlight the need for early ASD screening for children whose parents had prenatal depression to promote early intervention and support their healthy development. Mental health screening and prevention efforts for depression in pregnant individuals could also be beneficial.

Read the research summary.

Prenatal Depression May Be Linked to Autism-Related Traits in Children

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Prenatal Depression May Be Linked to Autism-Related Traits in Children

Authors: Lyndsay A. Avalos, Lisa A. Croen, et al.

Who sponsored this study?

The Environmental influences on Child Health Outcomes (ECHO) Program, Office of The Director, National Institutes of Health supported this research.

Why was this study needed?

Previous research suggests an association between prenatal depression or a history of depression prior to pregnancy and autism spectrum disorder (ASD) in children, but most studies have focused on a formal ASD diagnosis, rather than autism-related traits. Studying social communication and other autism-related traits can help researchers and clinicians understand how prenatal depression may be associated with these traits present in children at varying levels without a formal diagnosis. This is critical because autism‑related traits can impact children’s physical, social, and psychological development, regardless of whether they receive a clinical diagnosis.

What were the study results?

Children of mothers with prenatal depression had slightly more autism-related traits compared to those without. The association was similar among boys and girls. Prenatal depression also increased the likelihood of moderate to severe autism-related traits, indicating a higher likelihood of ASD diagnosis.

Footnote: Results reported here are for a single study. Other or future studies may provide new information or different results. You should not make changes to your health without first consulting your healthcare professional.

What was the study's impact?

This study adds to the understanding of how prenatal depression may be associated with neurodevelopment in children, such as social communication and behavioral characteristics that may not reach a clinical threshold but can still impact a child’s social and behavioral functioning. These findings highlight the need for early ASD screening for children whose parents had prenatal depression to promote early intervention and support their healthy development. Mental health screening and prevention efforts for depression in pregnant individuals could also be beneficial.

Who was involved?

The study involved 33 prenatal and pediatric research sites with information on depression in birth parents and autism-related traits in children. The primary analysis included 3,994 parent-child pairs with prenatal depression diagnosis data; a secondary analysis included 1,730 parent-child pairs with depression severity data.

What happened during the study?

Researchers measured the incidence and severity of prenatal depression and assessed autism-related traits using the Social Responsiveness Scale (SRS) for children up to 12 years of age.

What happens next?

While this study didn’t explore the reason for the association between autism-related traits in children and prenatal depression in mothers, future research may analyze parent and child genetic data to clarify whether certain genes increase the likelihood of depression and autism-related traits, or what other factors affect the findings.

Where can I learn more?

Access the full journal article, titled “Prenatal Depression and Risk of Child Autism-Related Traits Among Participants in the Environmental influences On Child Health Outcomes Program,” in Autism Research.

The content is the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Published August 1, 2023

Access the associated article.

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Prenatal Depression May Be Linked to Autism-Related Traits in Children

New ECHO Research Finds Higher Caregiver Stress Levels Linked to Sleep Issues in Children

Posted on July 25, 2023December 4, 2023 by Jodi Snare

Collaborative ECHO research led by Maxwell Mansolf, PhD and Courtney K. Blackwell, PhD, of Northwestern University investigates the potential link between poor sleep health of school-age children and stress experienced by their caregivers. This research, titled “Caregiver Perceived Stress and Child Sleep Health: An Item-Level Individual Participant Data Meta-Analysis,” is published in the Journal of Child and Family Studies.

Up to 50% of children and adolescents in the United States might experience sleep problems, which is an issue because poor sleep can negatively impact brain development, learning, and physical and emotional well-being.

There have been prior studies suggesting a link between poor sleep in children and stress experienced by their caregivers, but those were mainly limited to infants and young children. This study involved school-age children and teens, specifically 2,641 children between the ages of 6 and 18 from 12 ECHO research sites.

Caregivers participating in the study completed the Perceived Stress Scale (PSS) to provide data about their personal stress levels. They also completed the Child Behavior Checklist (CBCL), a parent-reported survey that provides information about a child’s well-being, including their sleep habits. Responses from the PSS and CBCL were compared and analyzed to evaluate how caregiver stress affected child sleep patterns, particularly by looking at CBCL responses that addressed children’s experiences with nightmares, insomnia, ongoing tiredness, and excessive and troubled sleep.

The study found that children whose caregivers reported increased perceived stress from their life circumstances may be at higher risk for sleep issues, reaffirming existing links between caregiver psychosocial state and child well-being. This association was consistent across different groups of child and caregiver pairs studied, even after accounting for mental and physical health conditions, highlighting the importance of screening for caregiver stress to create plans for children who may be at risk for sleep issues.

“This research suggests that children whose caregivers are under increased stress may be at particular risk for sleep issues, and screening for caregiver stress may represent a potential pathway for screening and intervention of child sleep issues,” said Dr. Mansolf. “This research also demonstrates the utility of cross-cohort harmonization, as responses from multiple versions of the Perceived Stress Scale were harmonized for use here.”

Future sleep interventions may consider a more global approach to improving child and adolescent sleep health. Continued research on the factors that influence family health and well-being may guide interventions that address the entire family and the dynamics of the family relationship.

Read the research summary.

Shortened Social Responsiveness Scale (SRS) Observed to be Comparable to Full SRS in Autism Risk Factor Estimation

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Shortened Social Responsiveness Scale (SRS) Observed to be Comparable to Full SRS in Autism Risk Factor Estimation

Authors: Marisa Patti, Kristen Lyall, et al.

Who sponsored this study?

The Environmental influences on Child Health Outcomes (ECHO) Program, Office of the Director, National Institutes of Health supported this research.

Why was this study needed?

The Social Responsiveness Scale (SRS) is a questionnaire used to measure social communication and autism spectrum disorder (ASD)-related traits. Researchers have developed a shortened version of the SRS, which included only 16 questions out of the original 65. This shortened version is intended to provide a very similar summary of behaviors and traits as the longer version but takes less time to complete.

As a new tool, the short SRS has been previously tested to ensure that it measures autism spectrum-related traits. However, it was not clear prior to this study if the short SRS can measure associations in epidemiologic analyses of autism spectrum risk factors in the same way as the full SRS so that research findings can be comparable across studies using both versions. In other words, do scores from both the short and long versions suggest the same associations? Or does shortening the SRS reduce our ability to detect risk factors due to differences in measurement? In this study, the authors tested associations with an established risk factor for autism diagnosis, preterm birth, or gestational age, to see if patterns were consistent across versions.

What were the study results?

Younger gestational age and preterm birth were associated with higher full SRS scores. The same associations were seen with short SRS scores. These associations are also consistent with associations seen for autism diagnosis, suggesting the ability of both the full and short SRS to detect risk factor associations.

Footnote: Results reported here are for a single study. Other or future studies may provide new information or different results. You should not make changes to your health without first consulting your healthcare professional.

What was the study's impact?

Gathering meaningful information for research studies can be a lengthy and time-consuming process for participants. This study shows that in some studies information collected using shorter assessments can be as useful as that captured using longer assessments, helping to reduce the time participants spend answering questionnaires.

Who was involved?

The study included 2,760 child-parent pairs from 11 different research sites within the ECHO Program. Participating children were between 2.5 and 18 years in age. The study sample included participants from research sites drawn from the general population, pre-term birth research sites, and familial-autism research sites, the last consisting of participants with a child diagnosed with autism.

What happened during the study?

Researchers collected caregiver-reported responses from both the full and shortened SRS. Information on gestational age and pre-term birth were collected from maternal reports on standardized questionnaires and from medical records.

What happens next?

Future studies are needed to investigate how comparable estimates are between the full and short SRS using other types of risk factors, such as genetic factors, and in other study populations. Researchers may also consider using the short SRS in future studies as an efficient measure of social behaviors.

Where can I learn more?

Access the full journal article, titled “A Comparative Analysis of the Full and Short Versions of the Social Responsiveness Scale in Estimating an Established Autism Risk Factor Association in ECHO: Do we Get the Same Estimates?” in the Journal of Autism and Developmental Disorders.

The content is the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Published July 22, 2023

Access the associated article.

Download this summary

Shortened Social Responsiveness Scale (SRS) Observed to be Comparable to Full SRS in Autism Risk Factor Estimation

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ECHO Researchers Characterize Children Born Preterm into Four Neurobehavioral Profiles

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“Accelerated” Biological Age at Birth Not Linked to Behavioral and Emotional Health Outcomes in Early Childhood

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Prenatal Depression May Be Linked to Autism-Related Traits in Children

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Shortened Social Responsiveness Scale (SRS) Observed to be Comparable to Full SRS in Autism Risk Factor Estimation

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