Momma Isis rat has let me check in on her and the babies one time before letting me know I had to go away (the last time I checked her she gently nipped at me and pushed my hand away.) I found momma and babies under the bedding, not long after the birthing, and Isis was busy cleaning and moving them. Isis let me rearrange the bedding and do an initial count. Isis has moved the babies a couple of times and appears to have accepted them. I'll leave her and the babies alone for awhile before checking in on them later tonight.