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Hehh-duHpp was a Klingon exercise used to teach infants hand-eye coordination so they could grow up to become warriors. It involved shaking a rattle in front of them to teach them rhythm and hand-eye coordination.
While taking care of the infant Kirayoshi O'Brien, Worf tried to teach him some hehh-duHpp. Later, he was inordinately pleased to hear from his wife, Jadzia Dax, that Yoshi had been repeating the ritual phrase to himself. (DS9: "Time's Orphan")