Peter Is Just a Baby — Marisabina Russo

Peter can't do any of the things that his big sister can. She can leap and skip, but he can only crawl. She only cries for very important things -- like scraping her knee -- but Peter cries all the time. She can use grown-up words and count in French; he can only say "dada" and "baba."
But after all, Peter is just a baby. Though maybe now that he's having his first birthday party, he'll be the sibling his big sister has dreamed of . . .
This charming, light-hearted book is the perfect story for any child adjusting to a younger sibling.