Lions give birth to 1-6 cubs after a gestation of 110 days. The cubs are born blind and helpless, and weigh approximately 2-4 pounds. Cub mortality is very high in lions, and less than half will survive their first year. Young males will leave their pride between 2-4 years if they can get away with staying that long, but sometimes they are forced out as early as 13-20 months. Females remain with their natal pride most of the time, although some will disperse and form new prides.