Tasmanian devils give birth to 20-30 young, each weighing approximately 0.18-0.24 grams. When the young are born, they move from the vagina to the pouch. Once inside the pouch, they each remain attached to a nipple for the next 100 days. Despite the large litter at birth, the female has only four nipples, so that no more than four young can survive birth. Those who do not procure a nipple are typically eaten by the mother.
Information source found here.