40 He claimed to have identified 58 stages of behavior when playing with a pellet (twenty-eight-week-old toddlers place an open hand over a pellet, according to Gesell, while forty-four-week-old toddlers hold it tightly) and 53 stages of rattle-grasping behavior.41 He even coined the term “Terrible Twos” and the phrase “he’s just going through a stage.”
