human babies’ metabolisms burn white-hot. Newborns drink 16 percent of their body weight in milk every day for the first six months of their life. To put that in perspective, an average 150-pound woman needs to eat and drink only about 5 percent of her body weight per day—a third of what newborns need. Babies put a massive portion of all that energy and fat and protein directly into building their oversize brains.
