There’s a first time for everything, and maybe, like the first word or first step, it's time we start celebrating them. Here are five milestones that no mom ever talks about. 1. The first boob slip It happens to even the most discreet of nursing moms. Whether you’re out and your baby whips her head around because she heard something, or you walk out of the bedroom into a roomful of in-laws and you forget to slip your nursing tank back into place, it's inevitable. 2.