Since 2007, almost one-third of mumps cases in the United States occurred in pediatric patients, and most of these patients were vaccinated, according to a study published in Pediatrics. Researchers analyzed mumps cases reported by US health departments during 2007-2019. The incidence and vaccination status of pediatric cases (younger than 18) were presented. During 2007-2019, 9,172 pediatric cases were reported, accounting for a median of 32% of all cases per year. Of the pediatric patients each year, a median of 87% had previously received one or more measles, mumps, and rubella (MMR) vaccine doses. Among the 5,461 pediatric cases reported during 2015-2019, only 2% of the 74% with known import status were associated with international travel; 1% and 2% of patients had complications and were hospitalized, respectively. Of patients aged 1 or older with known vaccination status, 74% and 86% of 1- to 4-year-olds and 5- to 17-year-olds had received one or more and two or more MMR doses, respectively. Pediatric mumps cases have been reported in most US states each year since 2016.