The female giant pandas ovulate only once a year (during the spring) and only for 2 to 3 days each time. The female giant pandas will leave their partners after mating and rear their cubs alone.
Giant panda gestation is about 83 to 200 days, and cubs usually were born in hidden hollow trees or natural dens, where the branches and dry hays well-prepared by mother pandas are available. Normally, the giant pandas are monotocous and rarely multiparous. Even the female giant pandas have two cubs at one birth in the wild, they would choose to take care of one and abandon the other.
Owing to feeding on bamboos, the giant pandas need to spend long time in eating to get enough energy each day, and they will leave their cubs to hunt for food for 2 to 4 hours each day even in their child-care periods.