The trend comes amid growing awareness of mental-health problems in small children.

Although my husband and I don't want to force the kids toward running (they're not even in kindergarten yet) , we thought a kids' race in New York's Central Park this morning would be fun for them.

The results appear in July's Archives of Pediatrics & Adolescent Medicine. The results mirror those at a few schools that have delayed starting times more than half an hour.

The results appear in July's Archives of Pediatrics &Adolescent Medicine.

One of the largest world carnivals designated for children, this year's Shanghai International Children's Cultural and Art Festival has attracted participants from as many as 17 countries and regions.