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trisomies
- Down Syndrome (National Library of Medicine)... an extra copy of a chromosome is called trisomy. So sometimes Down syndrome is also called trisomy 21. Down syndrome is usually not inherited. It ...
- Birth Defects (National Library of Medicine)What are birth defects? A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the ...
- Brain Malformations (National Library of Medicine)Most brain malformations begin long before a baby is born. Something damages the developing nervous system or causes it to develop abnormally. Sometimes it's ...