IMO you should take the male out when there are babies. I prefer that my females have their own tub, that will ensure that no babies are killed in a fight over who is going to care for them. Some females with fight, others won't, but I have not had any success leaving the male in the with females and babies. There are a few moms I always double up with another female rat because they don't care for their babies very well on their own. For example if you find cold babies you'll want to throw in another female that knows what she is doing that will keep them warm.