My 2 year old dd did a similar thing the other day. I was getting her clothes in the morning after she had just got out of the bath, and she shouted 'Look Mummy, I've got a hole!' I looked round and she was sitting there, peering in between her legs! Well, I started laughing so she got all self-conscious and stormed off in a huff and I had to go and apologise (she's in that 'terrible 2's' phase)
