Child and teen health

Britain's Prince Harry speaks at Windsor Castle, Windsor, England, Monday May 6, 2019, after his wife Meghan, the Duchess of Sussex gave birth to a baby boy. It is the first child for Harry and Meghan, who married a year ago. (Steve Parsons/Pool via AP)

FILE - In this Feb. 13, 2019, file photo, a health care worker prepares syringes, including a vaccine for measles, mumps, and rubella (MMR), for a child's inoculations at the International Community Health Services in Seattle. Officials in the Pacific Northwest say a measles outbreak that sickened multiple people is over. (AP Photo/Elaine Thompson, File)

Los Angeles County Department of Public Health experts, Muntu Davis, Health Officer, left, and Director Dr. Barbara Ferrer answer questions regarding the measles response and the quarantine orders during a news conference in Los Angeles Friday, April 26, 2019. Hundreds of students and staff members at two Los Angeles universities were sent home this week in one of the most sweeping efforts yet to contain the spread of measles in the United States, where cases have reached a 25-year high. (AP Photo/Damian Dovarganes)

FILE - This Feb. 6, 2015, file photo shows a measles, mumps and rubella vaccine on a countertop at a pediatrics clinic in Greenbrae, Calif. Hundreds of opponents of mandatory vaccines are opposing a California proposal to give state public health officials instead of local doctors the power to decide which children can skip their shots before attending school. They plan to pack the first legislative hearing Wednesday, April 24, 2019 on a bill that proponents say would stem bogus exemptions granted in many cases by doctors who are paid to excuse students from vaccinations. Supporters say pockets of unvaccinated students help to spread measles. (AP Photo/Eric Risberg, File)

FILE - In this Sept. 25, 2015, file photo, a child holds an Apple iPhone 6S at an Apple store on Chicago's Magnificent Mile in Chicago. The World Health Organization Wednesday, April 24, 2019, issued its first-ever guidance for how much screen time children under 5 should get: not very much, and none at all for those under 1. (AP Photo/Kiichiro Sato, File)

FILE - In this Oct. 30, 2009 file photo, a mother holds her baby receiving a new malaria vaccine as part of a trial at the Walter Reed Project Research Center in Kombewa in Western Kenya. The World Health Organization said Tuesday April 23, 2019, that Malawi has become the first country to introduce a pilot program vaccinating children against malaria using the only licensed vaccine to protect against the mosquito-spread disease. Although the vaccine only protects about one third of children who are immunized, those who get the shot are likely to have less severe cases of malaria. (AP Photo/Karel Prinsloo, File)

FILE - In this March 27, 2019 file photo, signs advertising free measles vaccines and information about measles are displayed at the Rockland County Health Department, in Pomona, N.Y. U.S. measles cases are continuing to jump, with most of the reported illnesses continuing to be in children. Health officials on Monday, April 8 said 465 measles cases were reported through last week, the second-highest total in 25 years. (AP Photo/Seth Wenig, File)