Mom is super young roughly 3-4 months old and she had 15 babies but lost 2 and has been doing her best to take care of the ones she has.The owner just brought them to us last night after mom kept escaping her bin cage with the babies and she put her and babies back with the dad.. This was an intentional breeding on her part and I don't know what she thought was gonna happen like maybe mom would have one or two babies maybe? She clearly did no research and was unprepared for and extra 13 rats.I have weighed all the babies and the smallest weighs 4 grams and the biggest weighs 7grams and the other fall in between. The are so small for their age even thier little heads look too big for their bodies. They are super active and taste testing everything I give to mom when they aren't storming her to nurse the poor thing she herself is tiny but I haven't weighed her because once they dropped them off and left as I was observing I realized that she is pregnant right now and even has shown some signs of labor so we know she was with dad shortly after birth.. Breaks my heart because she is a super sweet girl and gives lots of kisses and even babies are super friendly and I even got a couple of licks from them Is it possible they are small from her not being able to probably feed them or is it something more maybe? If my phone fixes itself I will get pictures.