S4·E47 A Surprise for Miss Martin

When Caillou finds out that Miss Martin's birthday is coming up, he wants to do something very special for her. He, Leo and Clementine decide to throw her a surprise birthday party. Mommy helps them make cupcakes, then shows them how to make flowers out of coloured paper. The party is a huge success - Miss Martin is very surprised, she loves her flowers, and the cupcakes are delicious!