Nude Pictures of Babies Children - Art of ?

I think that is just a form of art. I have naked pictures of my children, only their bums but I don't go showing them around. It is kind of like taking a picture of your child in the bath tub. I have a few pictures of my kids in the bath tub and they are nude. These pictures are only showed to my family or close friends. It is just a different for of art.