Young bears are called cubs. Cubs are normally born while the mother is still in hibernation. They usually weigh between 8 and 12 ounces when they are born.
There can be anywhere between one and five cubs born in each litter, but the average is two. These cubs are born blind and with a very fine coat of fur. The bear cubs' eyes do not open until they reach 25 days old. They do not leave the den until they reach about 2 months old, but they are not fully weaned until they are around 6 months old. The cubs normally stay with their mother until they are about 18 months old but are not considered to have reached full adult size until around the age of 6 years.