Normal
Sorry to hear of your loss Kael. It does happen though, they have hundreds of babies in the hope that at least one will survive to maintain the population, we can't expect them all to survive in captivity. As Enn said, don't let it put you off. There's bound to be a member here that can post you a nice plump sling or juvie, it sounds like you started with a skinny sling that wasn't feeding properly, there may have been little you could have done to change things.