DD has what looks like a hole just above her anus, but obviously it doesn't go anywhere. I noticed it when she was born, and the MW or paediatrician mentioned it too (I think they said a "pronounced..." something, but not to worry as it was closed off). In my post childbirth haze I didn't think to ask questions but I want to know what it is! Will it vanish as she grows or will she have it for the rest of her life? How common is it? Will it mean she's more susceptible to infection?