Each year, twenty million babies worldwide are born prematurely or with a low birth weight, and four million of them die, most in developing nations. Those who survive often suffer from low IQ, diabetes, and heart disease when they reach adulthood. According to the World Health Organization, 75% of these deaths and ailments could be averted by simply keeping these premature babies warm. Unfortunately, current options for warming babies in developing nations are either expensive or unsafe. The incubators sold in Western countries cost up to $20,000 and require electricity — which is unreliable in developing nations. And ad-hoc solutions like positioning babies under bare light bulbs are simply risky.