Moving the feet in the pedal way similar to their movement while riding a bike is a favorite of many babies. Sometimes a child makes this movement as a form of play, but it can be an expression of fatigue or annoyance over something. Here, we must focus on the child's eye view and facial movements. If he is smiling, this is evidence of his happiness, but when he moves the feet inconsistently and nervously, this is evidence of fatigue.