She is a first time mother (or so i believe) and she isn't always with her kids. I keep them in a quiet room and don't disturb them. I only open the cage to add food and water. The cage is HUGE for a single mouse and the nest is in a hollow log in the corner. Still...each time i enter, she is always wandering around some other part of the cage. I'm afraid she is rejecting her babies or perhaps not nursing them.