Each female bears only one offspring on average, every 3-4 years.
Till age six to ten months, infants rely completely on their mother. Males are not involved in raising the offspring. A mother carries her infant around her belly for the first month after birth. After this she carries it on her lower back. The infant wraps its tail around its mother’s and tightly grabs her midsection. Mothers are very protective of their young and these animals have a rather long 'childhood' for a monkey -this being more typical of apes.
The unusually long labia in females may be mistaken for a penis; its function is unclear (see image above).