There are usually two to three cubs in a litter of Pandas. Only one cub usually survives out of a whole litter.
Baby pandas weigh only 90 to 130 grams at birth and are about the size of a chipmunk. They are born blind and are covered in fine white fur but the regular pattern will come in in about a month. When they are about one year old they weigh about 25-35 kilograms.
The mother Panda will use a den for a month to a month and a half. The mother is only gone for three to two hours at a time but during that time the cubs are very vulnerable to predators such as leopards.
When baby Pandas are born they feed on their mother's milk. The cubs eat bamboo by the time they are six months old and do not need milk anymore by the time they are nine months old. When they are one year old they weigh 75 pounds. When they are between a year and a year and a half years old they will leave their mother and go out on their own, although the mom will drive the babies off when she starts to breed again.