In captivity they have a much better chance at survival. In the wild they all could be lost. They are pretty far down the food chain as babies and are a happy meal to just about every animal.
Even in captivity there is a chance some will not make it. "Failure to Thrive" seems to be the culprit in most of the deaths.
I feel failure to thrive is a developmental issue with some newborns. That survival drive switch just isn't turned on. They have little to no interest in eating and eventually dies of starvation. I've tried force feeding with these little one to no avail. For all I know it's wired in that a certain number of babies won't make it. Kind of a sacrifice for the benefit of the others.
I certainly don't know any of this as fact but think it might be this way.

Once that initial shed is completed keep them warm and dry but allow access to a nice water dish that is almost level with the substrate. Dehydration is a big concern with newborns.