When Lily was born seven weeks early, there was no one in the delivery room but a kind nurse named Margaret who held my hand. The labor was sudden and terrifying. I remember the fluorescent lights of the operating room and the frantic beeping of machines. When they lifted her tiny, fragile body out of me, she did not cry at first. There was only a terrible silence, and then a thin, warbling wail that was the most beautiful sound I had ever heard.