Over a lifetime, females usually raise three young to maturity. C. Gorillas at Birth. D. Care and Development of Young. An infant gorilla begins crawling at about nine weeks, riding on its mother's back at about 16 weeks, walking at about 35 weeks, and wandering among group members at about one year. Gorilla babies develop physical skills about twice as fast as human babies.
Silverbacks are tolerant parents that successfully rear weaned orphaned or abandoned juveniles.