How Big is a Marsupial Pouch?

The size of the mammal's pouch depends on the size of the adult marsupial and how long it is going to be used. Interestingly, marsupials give birth after a short gestational period and the baby is very, very small (1 gram or less). These tiny little marsupials live and feed in the pouch until the mother finds another home for them, like a nest, or until they are ready to go off on their own.