"The fight against child mortality that transformed parenting, doctoring, and the way we live. Only one hundred years ago, even in the world's wealthiest nations, children died in great numbers-of diarrhea, diphtheria, and measles, of scarlet fever and meningitis. Culture was shaped by these deaths; diaries and letters recorded them, poets and writers from Louisa May Alcott to Eugene O'Neill wrote about and lamented them. Not even the high and mighty...