as others have said it happens sometimes with new mothers . i always seperate my preggo females to their own cage to give birth and raise their babies . this IMHO not only reduces the stress on them , it also allows my to give them a week or 2 to recuperate after weening the babies before being bred again by the males . if i have a mother that eats her babies more than once i feed her off and start with a new female to replace her .