Kangaroos are less than 3 cm long when they are born. Its tail and hind legs are like grass sticks. Its eyes are closed, its mouth is just a small hole, and its ears are not well developed. Only its front legs are well developed, with toes and nails.
Therefore, it needs to stay in the mother's body for a period of time. Kangaroos can intuitively climb onto their mothers' abdominal bags as soon as they are born. Mother kangaroo licked a path for it on its fur. The baby kangaroo climbed to the mouth of the pouch step by step along this path, and then jumped into the pouch.
After getting into the bag, kangaroos can quickly find their mother's hanging nipples and hold them tightly in their mouths. A few weeks later, the baby kangaroo grew up under the nourishment of breast milk, covered with hair and ears, opened its eyes and poked its head out of the pouch.
After a few months, kangaroos can play outside the bag. But if it is in danger, it will immediately jump back into its mother's pouch. After six months, the kangaroo couldn't hold it in the pouch. It gradually ate grass and plants by itself and began to stand on its own feet.
Extended data
After four or five weeks of pregnancy, mother kangaroo gave birth to a kangaroo the size of a pencil head. It is 2 cm long and weighs 0.5 ~ 0.75 g. It is hairless and invisible. With its forelimbs and keen sense of smell, the kangaroo climbed into the pouch along the path given to it by its mother and grew up with its nipples.
After 200 days, the kangaroo can go out for activities, but as soon as it is in danger, it will immediately get into the bag and run away with its mother. When the child in the bag is old enough to live independently, the mother will not allow it in again. Kangaroos have amazing fertility. When the children in the bag can live independently, the second child is born, and at the same time, the mother is pregnant with the third baby.