No I am not a breeder so far is 1 still a live
Hi Rubyn again. Since we still don't know about the circumstances - e. g. how old is the mother, is she in good condition? - it is really hard to tell what went wrong. It can be that the mother could not provide enough nourishment in the womb, or that the babies had genetic defects or that you disturbed the mother when/after she was giving birth and ate or hurt the babies! It's very important not to disturb the mother in the beginning and leave her be, I know so much.

But hedgehog babies might be born dead even if you and the hedgehog mother did your best, it happens from time to time.
But you have to avoid that it's happening again - if you don't have years of experience with or at least read up on breeding hedgehogs, it's obviously easy to make mistakes. That's why it's so important that hedgehogs aren't bred like street cats. If you got the mother hedgehog in a pregnant state, contact the previous owner and ask them questions. If your hedgehogs are the opposite sex, and it's their babies please please keep them separate in the future! Meaning, they shouldn't be in the same closed space even for a minute.