In 2004, Harvey Karp delivered a lecture about the fact that some 3,500 babies in the U.S. died each year from sleep-related deaths before their first birthday.
“I said if a foreign country killed 3,500 of our babies, we would go to war,” Dr. Karp, 71, recalls over video from his office in Los Angeles, where he works with Nina Montée Karp, his wife and business partner.
According to the Centers for Disease Control and Prevention, the rate of sudden infant deaths hasn’t declined since 1999.
Fewer infants are dying in their cribs, owing to a public-health campaign launched in the early 1990s advising parents to put babies down on their backs.
But Dr. Karp notes that “babies don’t sleep well on their backs, so poor, tired parents” are bringing them into their own beds, where babies are more likely to die of suffocation.