You should stop bathing with your daughter ASAP!!! She is four years old and she should be able to sit alone (w/ supervision) and bathe herself. Kids are way to intelligent these days. They are born solving mathematical equations. She no longer needs to see a grown man's dick.

I do think that YOUR bathing with your son is not harmful, but what is the point? Your bathing him shows your bondness. He doesn't have to see you nude. Don't do it.

Congrats to you, your wife, and your little girl!