A big sister anticipates the birth of a new sibling in this warm and funny stage-by-stage picture book tour of all the sizes of a growing baby, from teeny-tiny poppy seed to giant watermelon. It's hard to wait for an exciting new baby to join the family, especially when it's still growing inside Mom's tummy. But when her dad tells her the size of the baby at each stage, one little girl imagines all the fun she can have with her baby brother as a teeny-tiny poppy seed, then a grape, then a lemon... But she's not quite sure how she feels about having an avocado for a brother. Or an onion. Or--gulp--a watermelon!