Cribsheet: A Data-Driven Guide to Better, More Relaxed Parenting, from Birth to Preschool (The ParentData Book 2)

by Emily Oster

Here is the truth: you are less likely to get pregnant if you breastfeed, but it is not—I repeat, NOT—a reliable birth control method, especially as your child ages and if you ever go more than a few hours without feeding or pumping.