In When I Have a Little Girl, a little girl (reminiscent of the irrepressible Eloise) daydreams about when she will have a child of her own. She fantasizes that her daughter will be allowed to do all the things that she could never do. Like wearing a party dress to school every day. Or having a bath only once a week.
In When I Have a Little Boy, a little boy imagines how he would behave if he had himself as a father. He gets away with a good deal more than he ever has. He stays up late to hobnob with all the adults at his parents' parties. He eats ice cream sundaes all the time and sleeps in the yard whenever he wants.
Intended to be read by parents and children together, both stories hold a tender message both about being a child and having a child of one's own.