what causes six fingers
The condition of having extra fingers or toes is known as polydactyly. It is a congenital disorder, which means that a baby would be born with polydactyly, and did not develop the disorder after he or she was born, and there are several reasons why people may have supernumerary digits (extra fingers).s polydactyly is usually caused by a random mutation, only one of the parents would be affected and so inbreeding does not increase the likelihood of a child developing polydactyly. If both parents were polydactyls, then the likelihood of the child being affected is 75% but this is not increased by inbreeding.