Clinical Report: Phthalates Linked to Shorter Gestation

Overview

A large cohort study evaluated 5,318 mother-child pairs from 18 US sites to investigate the association between urinary biomarkers of phthalates and alternative plasticizers during pregnancy with gestational length and birth weight-for-gestational-age z scores. The study found that specific phthalate metabolites were linked to shorter gestational length and lower birth weight-for-gestational-age z scores.

Background

Phthalates are widely used industrial chemicals known to disrupt endocrine function and have been linked to adverse pregnancy outcomes, as noted in various studies. Understanding their impact on gestational length and birth weight is crucial for maternal and fetal health, especially given the prevalence of these chemicals in consumer products.

Data Highlights

Key Findings

• Eight phthalate metabolites were associated with younger gestational age at birth.
• Detection of phthalic acid correlated with approximately 1.1 fewer days of gestation.
• Summed phthalates and alternative plasticizers were associated with a 0.06-point lower birth weight-for-gestational-age z score.
• Subgroup analyses indicated stronger associations in male newborns compared to females.
• Fifteen analytes were linked to lower birth weight-for-gestational-age z scores.
• Associations with preterm birth were noted for several phthalate metabolites.

Clinical Implications

Monitoring and advising on environmental exposures may be beneficial in prenatal care.

Conclusion

The study found significant associations between phthalate exposure during pregnancy and adverse birth outcomes, indicating a need for further research.

Related Resources & Content

1. JAMA Network Open, 2026 -- Gestational Exposure to Priority Chemicals and Birth Outcomes
2. Frontiers in Endocrinology, 2026 -- Neonatal exposure to di-(2-ethylhexyl) phthalate (DEHP) through breastfeeding leads to dysfunction endocrine-metabolic outcomes in male rats at adulthood
3. Archives of Toxicology, 2023 -- Concentration, fetal sex, and trophoblast cell type influence transcriptomic alterations in placental cells induced by Mono(2-ethylhexyl) phthalate
4. Archives of Toxicology, 2022 -- Integrating DEHP into the Adverse Outcome Pathway Framework for Female Reproductive Toxicity in Humans
5. Reducing Prenatal Exposure to Toxic Environmental Agents | ACOG
6. Endocrine Disrupting Chemicals: Threats to Human Health
7. FIGO committee opinion: Environmental drivers of obstetric health and early childhood development - PMC
8. EPA Announces Schedule for TSCA Risk Evaluations of Phthalates | US EPA
9. Frontiers in Endocrinology — Transgenerational exposure to plastics-derived endocrine‐disrupting bisphenol A and its analogs on male infertility: impact of gut dysbiosis and epigenetic regulation
10. Reducing Prenatal Exposure to Toxic Environmental Agents | ACOG
11. Endocrine Disrupting Chemicals: Threats to Human Health
12. FIGO committee opinion: Environmental drivers of obstetric health and early childhood development - PMC
13. EPA Announces Schedule for TSCA Risk Evaluations of Phthalates | US EPA
14. Gestational Exposure to Priority Chemicals and Birth Outcomes
15. Prenatal phthalate exposure and adverse birth outcomes in the USA: a prospective analysis of births and estimates of attributable burden and costs - PMC
16. Periods of susceptibility for associations between phthalate exposure and preterm birth: Results from a pooled analysis of 16 US cohorts - PMC