Anne Halsall is the kind of badass mom who made her own nursing app when she couldn’t find one she liked. Like, coded it. In her “spare” new mom time.

 Like a lot of new moms, having a baby was more of a career accelerator than a career killer for Halsall. She and her co-worker, Sara Mauskopf, decided their time away from babies had to matter. They were worked at Postmates, and getting people a burrito faster just didn’t seem as meaningful anymore. So they left to co-found Winnie.com, a directory for parents...