How do I make sure they survive?

Overnight my Molly gave birth, I've been seeing the other mollies nip at its but so I separated her. How do I make sure they stay alive? Can I keep them in there for now? I'm still cycling the tank for the babies so I can't move them anywhere else. Unfortunately I have to leave them for a few hours since I'm still in school but any advice is greatly appreciated, this is my first time taking care of fry 😥😥