It usually means that a baby is born with at least six fingers on one or both hands or six toes on one or both feet. It's one of the most common limb differences, affecting one out of every 500 to ...

In humans (and most other living things), these ... blue-eyed allele from both parents instead of just one. So to a geneticist, what “six fingers is a dominant trait” actually means is that ...

That’s because this allows the hand to grow almost twice the size it was at birth. During the surgery, they’ll remove additional fingers and most likely pick one of the digits to use as a thumb.