U.S. regulators have authorized the first COVID-19 shots for infants and preschoolers. That paves the way for vaccinations for children under 5 to begin next week. The Food and Drug Administration’s emergency use authorization Friday follows a unanimous recommendation by its advisory panel. The kid-sized shots are made by Moderna and Pfizer. The FDA’s action allows the companies to begin shipping millions of preordered doses across the country. A final signoff from the Centers for Disease Control and Prevention is expected this weekend. The nation’s vaccination campaign began with adults in late 2020, about a year into the coronavirus pandemic.