This spring saw the reign of a popular infant sleeping device unravel. The Fisher Price Rock ‘N Play Sleeper was a type of infant hammock, consisting of a fabric and padding-covered plastic shell, suspended on a foldable metal frame. The Rock ‘N Play was the brainchild of Fisher Price industrial designer Linda Chapman, whose first-born had suffered colic years earlier. At the time, she testified, there was no good way to elevate an infant’s head, neck and torso, to relieve its gastric discomfort.