I was hunched over the kitchen table, tracking ounces on a laminated chart with a dry-erase marker, crying so hard I couldn't see the numbers. It was 2:40 a.m. My nipples were bleeding. Lily was screaming. And the book said she should be sleeping. "Stretch feeds to four hours," it said. "Teach her to self-soothe." So I shushed. I swaddled. I walked in circles around our dark apartment, whispering affirmations I didn't believe.
A recent French study found that a specific species of bacteria can improve maternal behavior in stressed rat mothers. The researchers stressed the rats by putting them in the rat equivalent of a crowded subway car. The stressed rat moms neglected their newborns. But when the scientists put Lactobacillus reuteri into their water, normal maternal behavior was restored.