A newborn kangaroo is about 1 inch in length -- approximately the size of a lima bean. Still essentially a fetus, the newborn kangaroo "swims" through its mother's fur to reach her pouch where it latches onto a teat which swells inside its mouth. The baby kangaroo or joey will remain fused to the teat for four to five weeks. After 7 to 8 months inside its mother's pouch, the infant will venture outside, returning only to feed. In the case of multiple infants belonging to the same mother, each infant feeds only from its own individual teat, and each teat provides a different mix of nutrients depending on the age of that particular infant.