New mom Drew Barrymore appeared on Good Morning America this morning, and she shared the source of baby Olive's name. "My husband and I were looking through a book and it talked about what size your baby was as it's growing inside of you. They always use food for some reason for a reference, and at that time our baby was the size of an olive. That was it, we never looked back!" Learn more about how motherhood has changed Drew and how little Olive has turned her into a morning person.