Newborn kangaroos can weigh as little as 0.03 ounces (0.85 g), or about the
size of a lima bean.

Like humans, female kangaroos usually give birth to one joey, or baby
kangaroo, at a time. Unlike a human newborn, a newborn kangaroo can weigh
as little as 0.03 ounces (0.85 g), or about the size of a lima bean. After
birth, a joey uses its well-developed claws and forelimbs to crawl into its
mother's pouch where it will feed, grow and continue to develop.