I Used to Be the BabyBook - 2002
A young boy helps his mother take care of his baby brother.
"I used to be the baby, but now I am big." So begins this story of a not-very-big sibling who suddenly finds himself with a baby brother. He willing shares his toys with the baby, he plays with him, and he knows when to be quiet. He sings a cheerful song when it is needed, and he teaches his brother many useful lessons. But sometimes even the biggest of us likes to be the baby -- and in this loving family, that is no problem at all!
Now that there is a newborn in the family, the older sibling has a new role to play, using his know-how and experience to make the new baby feel right at home.