“I didn’t realize I had a deformity until I went to school and saw everyone with two normal hands,” Brianna Cope tells PEOPLE ...

Mirror hand syndrome, also known as ulnar dimelia, is an extremely rare congenital (meaning it's there from the time you're born) birth defect that affects your hand. In some cases, your forearm and ...

Doctors have warned against jumping to conclusions after three births at one hospital in which children were born with hand deformities. Clinicians are investigating whether the anomalies are linked.

Birth defects happen during fetal development, often in the first three months of pregnancy. They can be mild or severe, and they can affect appearance, organ function, or development. Causes include ...

Birth defects affect 3% of pregnancies in the United States. Screening and diagnostic tests during pregnancy can identify many birth defects. Parents can take critical steps to help prevent certain ...