In the summer of 2014, I gave birth to a baby boy. He was born with a perfect Apgar score, after a very easy delivery. But my labor had not been smooth—in fact, throughout the day and a half of contractions, I believed there was something decidedly wrong. I also felt that way as I held him for the first time, and he writhed violently under my hands. In a video taken about 10 minutes after he was born, he can be seen lifting his head up off my chest. “Ooooh, look at how advanced he is!” someone can be...