Caregivers sleep with the young charges at night in the stables. Most of the rescued babies survive the traumas that left them orphaned and will start to be rehabilitated into Tsavo National Park in southeastern Kenya when they are about four.Raising baby elephants is not easy: they have complex emotional as well as dietary needs. It took a decade to perfect a milk formula that today is fed to the babies until they become more independent. At the Nairobi nursery they are fed every three hours, imbibing 24 litres a day.