To stay healthy it takes alot of work. You have to wash, brush your teeth, eat good and get plenty of excercise. As Caillou finds out, you also have to go to the dentist and the doctor for regular check-ups. Even daddys get sick sometimes, unfortunately for Caillou it is on the day when daddy was going to take him to work. That's ok because Caillou has to help mommy take care of daddy. When Teddy gets sick he has Rexy and Gilbert to make him all better again. Those itchy bumps can mean only one thing...Caillou has the chicken pox!