I know the importance of mother's milk in mammals. I'm Pre-Med.
At 21 days, I'm taking them away from her, but not a moment before. I think the remaining ones are 2 boys and one girl, anyway, so I'll have to separate the boys from their mother, anyway.
I didn't start touching them until they were 12 days old, like most everything I've read said to. Sometimes before her very eyes, but usually not. They were always placed back discretely within the nest, without a lot of fuss and trouble.
She's not a first-time mother. Unbeknownst to me when I bought her, she had been nursing some at the pet store where I got her, and then the stupid pet store employees took her away from her babies, even though I TOLD them I didn't want a nursing mother, I just wanted a female. I had thought the enlarged nipples were just because she was pregnant, but that theory was squashed when it was a full week before she had her babies.
I don't have the foggiest idea how old she is, but she's larger than the male-female pair I got at about 5 weeks of age.
I've been feeding her a very high-nutrition (especially protein) food mix, and she's been getting fresh food and vitamin supplements.
All 5 of the dead ones were Albino, with a minor skin problem. There is one Albino left, still with a minor skin problem. The 2 Agouti babies have no skin problem, and she hasn't killed them, even though I held them as much as I held the dead Albinos. I think there is something wrong with the Albinos, and that's why she's killing only them. But that's just a theory. I don't really know. I just know that she's killing them.