Well i must be bad then! I leave Lily in the bath by herself and she is only 3. She does talk and sing though so i always hear her and i check on her every few minutes asking if she is ok. I don't leave Charlie by himself though or even if Lily is there with him. I will usually give them both a bath to start and then take charlie out after is little play and wash and then let Lily play in there herself. It's kinda liek a time out for her form Charlie aswell.