AdvertisementBig Babies Helped Shape Early Human SocietiesJanuary 10, 2011Joe PalcafacebookEmailA three-month-old baby bonobo plays with its mother at a zoo in Frankfurt in 2008. A newborn ape typically weighs about 3 percent of what its mother weighs, while human babies weigh about 6 percent of their mothers' weight. (AFP/Getty Images)
