Pademellons are wallabys. Kangaroos are different. There is a rat kangaroo, but its really a Wallaby. Wallabys are usually 3 foot and under when full grown. Kangaroos and Wallabys are all from similar families.
Marsupials breed here during the winter, which necessitates the pouch.
Technically they aren't born until they come out of their pouch. Kangaroos can stop the development of the fetus at any given time, say in times of drought, to insure survival. For example, the growth of the fetus in a mother can be suspended for any length of time. The longest known time is 12 years before the fetus was allowed to continue to grow. Usually its stopped right before the fetus is about to be born so that it can be born when the time is right.