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Cubs open their eyes within the first month.
The cubs begin walking while in the den at about two months. By this time, they also have thick, whitish fur and their teeth have erupted.
By the time the mother and cubs emerge from the den in late March or April, the cubs weigh 10 to 15 kg (22-33 lb.).
A mother will sometimes carry her cubs on her back through areas of deep snow or water.
Cubs begin eating solid food as soon as their mother makes her first kill on the sea ice (about three to four months of age).
By eight months of age, they weigh over 45 kg (99 lb.).
Polar bear cubs learn to hunt by watching their mother.
When her cubs are about 30 months old, a female polar bear is ready to breed again. At this time, an adult male may begin following her. Either the mother bear or the male chases away the cubs.