How many pets are too many for a newborn?

Ultimately, this is her decision. Anything you do (like calling animal control) would result in a huge rift in your relationship with her. While I do understand that is a lot of animals in a small space, it's just not your place. The fact that the animals haven't interacted with children is not really an issue at this point. When my first child was born we had two cats and a young dog, none of whom had ever been around children. All three adored my daughter and watched over her. Since my pets were treated as family members, they understood that our new baby was theirs to take care of as well. (I'm actually sad right now, because our "mama cat" went missing a few months ago and our next baby will never know her.)

The bottom line is that if the apartment is clean, there are no health issues to worry about. Studies have actually shown that having pets during the first year of life actually reduce the occurrence of allergies and asthma in children. Caring for pets teaches kids responsibility and helps babies learn how to control themselves (with hitting, etc.).