Females should be separated from males while nursing. It is not healthy for females to have back-to-back litters, and they can breed again only hours after giving birth. That's a fast track to killing your female quick. Even if they are feeder breeders (especially if they are feeder breeders... they are giving your snakes their babies lol) you should try and keep them as healthy as possible. It is also a lot of stress on the female to have a male wanting to mate all the time and getting all up in her nest.