Thanks for the response, and I will try to give more info.

-They are on aspen (and i give mommas newspaper for nests)
-I give them things like paper towel tubes and empty water jugs cut in half for hiding in
-they eat a dogfood for overweight dogs for a base food (with rat treats, veggies, peanut butter, ect.)
-there are 2 females and one male in a 2ft x 2ft x 1ft ventilated space
-3 sides of the space are tinted
- the room has an ambient temp of around 70 at all times
-I have other colonies above and below them, but only one female has given birth so far - yesterday. so i cant say whether she will raise them fine or not.

there were no injuries on any of them, which really confused me. I have bred mice before with no problem, and my rats once before back in the day. Is it possible that she's too old? I don't know the history on her or how old she is....?

Thanks for all your help in advance