Study of early development in babies with extra sex chromosomes
Part of Brain & nervous system, Genetic & congenital, Hormones & metabolism, Kidney & urinary, Mental health, Women’s health & pregnancy clinical trials.
This study follows infants and young children with conditions caused by having an extra sex chromosome (like XXY, XYY, or XXX) to learn how health and development unfold over time. It may help families and doctors understand what to expect and what support could be helpful.
Summary written for real people, not researchers, by Clin2.
Who can take part
- Your baby was diagnosed before birth as having an extra sex chromosome (prenatal testing).
- After birth, testing confirmed the specific sex-chromosome condition (including some mosaic forms).
- Your family can complete study visits in English or Spanish.
- Your baby is between 6 weeks and about 12 months old (plus 30 days) when you enroll.
Quick eligibility check
Answer a few plain-language questions, based on this study's own requirements, to get a preliminary sense of fit.
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