one of my cousins was born with an extra finger on each hand. for some reason my aunt had them removed right away.
No one is going to hack them off with a carving knife. Having 6 digits doesn't necessarily mean that there is an extra, fully functioning finger lined up with the rest. It is sometimes just a skin tag hanging there, or a funky-looking thing between two normal fingers, which could screw up the developement of those fingers if it's just left there.
