gerbils are usally in female pairs when they have babies, their is always one female besides the mom they helps nurse the babies and take care of them. when I bred my gerbils I always had tippy live with the mom, some are very good moms like speedy and sandy were however some like emma and sage i guess need another female that can help them out. I dont kno wwhat you can do about it now I 'm afraid, I had used tippy(emma's little sister) for emma.