All pandas are born very small. The average weight is 100g (0.2 pounds), which is only 1/900 of their mother’s weight (compared to about 1/20 for humans). The lightest one on record was only 36g (0.1 pounds) and the heaviest one was 210g (0.5 pounds).
According to experts, "the tiny birth size is definitely a result of evolution over millions of years. It is a kind of breeding strategy.
The strategy is due to the fact that pandas subsist almost entirely on bamboo, which has a very low nutritional value".
Newborn giant pandas are pink and furless. The iconic black and white coloring come later, after about 3 weeks. The mating season is in spring between March and May. Males and females usually associate for no more than 2 to 4 days. Pregnancy lasts from 95 to 160 days.