A female wallaby is ready to breed from 14-19 months of age. She will give birth to embryonic young that are extremely undeveloped. The tiny newborn joey is blind, hairless, and about the size of a bean. When it is born, it crawls into its mother's pouch where it attaches to one of the teats which swells inside the joey's mouth, ensuring it will not be dislodged when the mother moves. The joey is reay to leave the pouch permanently at about 8-9 months of age, but is likely to remain in its mother's home range until it is around 2 years old.
Wild red-necked wallabies live 7-10 years, while in captivity this period extends to 12-15 years.