It's Bertie's birthday and he's going to have a birthday party. There's a birthday cake to be made, and decorations to be hung, and games to be played, and best of all, presents to be opened. But where is Daddy's present? Daddy has hidden it so well, he cannot find it himself.

Bertie wants to be just like Daddy and drink coffee, shave, and use a credit card, but all he ever hears is "When you're bigger..." or "when you grow up...". At last the tables are turned when Bertie plays with his trains, and Daddy wants to be just like Bertie.