both polyandrous and polygynous mating occurs, and males contribute heavily to parental care. but typically, only one adult female in a group is reproductively active, and reproductively active females mate with multiple males if given the opportunity. males carry and groom infants more than females do. older siblings may also contribute to infant care, although infants prefer to be carried by their parents than their siblings. infants become mobile at 2 to 5 weeks, and begin eating solid food at 4 to 7 weeks. they are independent at 10 to 18 weeks and are fully weaned at 15 to 25 weeks. geoffroy's tamarin becomes sexually mature at about 2 years, and can live up to 13 years.