Any woman admitted to the Labor and Delivery floor at the Boston Medical Center (BMC) who delivers a singleton live infant and meets our case (gestational age \<37 weeks or birthweight \<2,500 grams) or control (full term birth with birthweight \>2,500 grams) criteria will be eligible.
Postnatal follow-up of enrolled mother-child pair is conducted from birth to age 21 years.
The Boston Birth Cohort has high-quality biospecimen collection, and comprehensive epidemiological, clinical, and environmental exposure data via standardized questionnaire interview, measurements, and review of the electronic medical records.
