Shenzhen Birth Cohort Study

The Shenzhen Birth Cohort Study is a long-term research project that follows pregnant women and their children from before birth through the first 7 years of the child's life. The goal is to understand how factors during pregnancy and early childhood — such as environment, nutrition, and health conditions — affect a child's development and health outcomes over time. This is an observational study, meaning there is no experimental treatment involved. Mothers participate by allowing researchers to follow their pregnancy and their child's health checkups at the participating hospital in Shenzhen, China. You may be eligible if: - You are pregnant and plan to deliver and attend child care at the participating hospital - You plan to reside in Shenzhen for at least the next 7 years - Your pregnancy is less than 20 weeks along - You agree to have your child followed up regularly until age 7 - You are willing to provide informed consent You may NOT be eligible if: - You are more than 20 weeks pregnant - You cannot guarantee delivery at the participating hospital - You are unable to participate in child care at the hospital - You are mentally incapacitated and have no guardian to provide consent - You are unwilling to sign the informed consent form Talk to your doctor to see if this trial is right for you.