A baby gorilla is called an infant, just like a human newborn. When gorillas are born, they weigh about 4 1/2 pounds. They develop quickly and are walking within six months.
Gorillas remain with their mothers until they are between 4 and 6 years old. Because of these dependent youngsters, females give birth only once or twice a decade. Gorillas are not fully adult until they are about 10 years old. At this age, a gorilla is ready to reproduce, so it seeks a mate. Several females and their offspring live in groups led by one protective adult male, the silverback. Gorillas have a life span of about 50 years.