well, maybe they aren't babies, they are small; but I'm really not familiar with mice (used to have rats as pets way back in the day ..) the mouse is probably 2 1/2 inches long .. does that sound like a 'baby' or an 'adult'? I just go in and ask for a 'feeder mouse', and that's what they give me (that's what they were feeding my BP when I bought her. Should I be feeding her something bigger?