Researchers have identified a rare disorder that causes babies to be born with extra fingers and toes and a range of birth defects. The disorder, which has not yet been named, is caused by a ...

The disorder is called polydactyly, which causes babies to be born with extra fingers and toes as well as a range of other birth defects, according to research co-led by University of Leeds.

But with polydactyly, an extra finger or toe grows from the limb bud. Based on the research literature, about one in 700–1,000 people born have polydactyly. Having an extra finger on the side of ...