Child mortality has hit a historic low around the world — fewer then 5 million deaths a year. But experts believe that millions more could be saved by relatively cheap, simple interventions.

A new study looks at the reduction in mortality among vulnerable babies if kangaroo care — skin-to-skin contact — is started soon after birth.

Can the warmth of a parent's chest be a boon to babies, especially premature births? In the 1970s, Colombian researchers found it did. The technique has gone global. Ivory Coast is the latest convert.