" Over a 10-year period following the introduction of the campaign, the rate of SIDS death fell by half. As with any medical innovation, with that success came a rather unforeseen but thankfully somewhat benign complication. Babies who sleep on their backs, while the boney plates that form the back of their skulls are still forming and fusing, become more likely to have slightly misshapen heads. And babies with misshapen heads became far from exceptional: During the years in which back sleeping became the norm, the incidence of such affects quintupled.11 "

― Sharon Moalem , Inheritance: How Our Genes Change Our Lives—and Our Lives Change Our Genes