Im pretty sure but dont know for sure :)
8 weeks
The parents care for them for 3 to 4 weeks. After that, they're on their own.
about 4 weeks.
Mice, in general, can survive only 2-3 without food or water.
they leave their baby penguins when they hatch
I think the earliest baby that ever survived was 21 weeks? But babies born early are very sick and do not survive a lot of the time. The earliest that is normal to have the baby is 37 weeks, which will be about 3 weeks before you due date. I had my last baby at 35 weeks and he was 6lbs 9oz and very healthy. It's dangerous to have it earlier than that because the lungs haven't developed enough for the baby to breathe on its own.
my mouse took 2 weeks to eat on its own it depends
Baby platypuses do not have to survive on their own. They suckle from their mother for at least four months, and tend to stay with her until they are around eighteen months to two years old.
None. A kangaroo joey cannot survive on its own. It must be at least a year old.
Anything, that's an animal, that is a baby usually can't survive without its mother. But later on they out grow it and learn to survive on there own. =)
4 to 6 weeks.
About seventeen weeks.