The U.S. Food and Drug Administration (FDA) has issued warning letters to three infant formula manufacturers for violations of federal safety regulations. The warning letters were issued to ByHeart Inc., Mead Johnson Nutrition (Reckitt), and Perrigo Wisconsin, LLC[1][2][3]. The FDA’s Infant Formula regulations were violated by these companies, and the warning letters reflect findings from FDA inspections of these facilities over the last several months[2].