Drowning Is No. 1 Killer of Young Children. U.S. Efforts to Fix It Are Lagging.

Yadira Salcedo was born in Mexico to parents who did not know how to swim. As a child, she nearly drowned when she waded too deep in a backyard pool.Now a mother of two in Santa Ana, Calif., Ms. Salcedo is “breaking the cycle,” she said, making sure Ezra, 3, and Ian, 1, never experience…