12 pair - both sexes: Both male & female babies are born with 12 pair of ribs.
Answered 8/27/2013
4.9k views
Usually 12 pairs: Most people have twelve pairs of ribs. Some people only have 11 pairs. Higher frequency of abnormal numbers of ribs sometime include congenital syndromes such as Down syndrome (11 pairs), other chromosomal abnormalities (13 pairs) , esophageal atresia (failure of esophagus to develop normally (13 pairs).And congenital vertebral anomalies and scoliosis where different amount of ribs on each side.
Answered 10/20/2016
4.9k views
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