More than 16 million millennial women are now mothers, and that number grows by more than a million every year. These new parents demand innovations in child rearing to match their experiences in other realms of their lives. These “parennials” are information-hungry; they never stop researching the best things to buy for their children. There are numerous resources for them to learn about parenting, such as chat rooms like Wonder Weeks and WebMDBaby. Many parennials, accustomed to chronicling every great dish they ordered in a restaurant, give their children YouTube channels from the first sonogram and hashtags when they’re born. What is the next “killer app” for young parennials?