 Breeding may be continuous throughout the year . Copulation often occurs while suspended with the hands and feet clinging to horizontal branches for support . In captive Sunda slow lorises , mating primarily occurs between June and mid @-@ September , with the estrus cycle lasting 29 to 45 days and estrus lasting one to five days . Likewise , gestation lasts 185 to 197 days , and the young weigh between 30 and 60 grams ( 1 @.@ 1 and 2 @.@ 1 oz ) at birth . Females reach sexual maturity at 18 to 24 months , while males are capable of reproducing at 17 months . However , the fathers become hostile towards their male offspring after 12 to 14 months and will chase them away . In captivity , they can live 20 or more years . 
