Mating period for dwarf hamsters

Question
Our dward hamster had babies, didn't know she was PG when we bought her.  We removed the male within 24 hours of their births and she got PG again.  How soon after giving birth can they breed?

Answer
They can give birth in only a few hours after giving birth. Generally it's like the first 1-4 hours after giving birth they are fertile again. The male babies should be removed when they are 21-26 days old. The father should be removed a few hours before she gives birth.