"While the babies are adorable and much-loved, births ... at sanctuaries are highly discouraged," Jenny Desmond of HSUS told The Dodo. "These young chimps will need lifetime care as well, with a potential life span of over 50 years."
She also explained that the fact that these mothers were former research chimps makes it more challenging for them to raise babies. Many have lived their entire lives in captivity, and those who didn't were captured at far too young an age to remember how their mothers cared for them. "The abuse these chimpanzees suffered makes the risks of miscarriage, infant deaths, lack of ability to care for new babies, and illnesses transferred from mother to infant much higher," she said.
Yet, when NYBC withdrew support and essentially left these chimps to die, these mothers managed to keep their babies alive against the odds.