In 2019, more than 80% of infants started out receiving some breast milk. That's a massive spike from nearly 50 years earlier when just 22% were breastfed. It's hard to know if breastfeeding is causing improved health outcomes in children. Or if the improvements are due to factors that researchers can't control for.
In this special episode of Freakonomics, M.D., host Bapu Jena looks at a clever new study that could help answer one of parenting’s most contentious questions.