 They'll be the first to enter the U.S. in 21 years. Once they get here, they'll be given a few weeks to acclimate to their new surroundings before they make their public debut. New numbers from the Census Bureau show there aren't as many kids around anymore. The population of children fell about 3% since the start of the pandemic, with New York, L.A., and Chicago accounting for about 30% of the decline. An exception is Florida, where several areas were among the fastest growing for children.