J.D.
Karen Katz has great books. Her one on becoming a big sister is Best ever Big sister. Each page starts with "I'm a Big sister." then one page for example says My baby sister has to ride in a stroller. On the opposite page is a picture of baby in stroller and at the bottom it says..."but I can..." then you lift the picture to see the girl on a trike and and it says "ride my trike."
It is a great book and the drawings are very well done.