21. A 3-mоnth-оld infаnt is diаgnоsed with developmentаl dysplasia of the hip (DDH) after the pediatric provider notes a positive Ortolani sign and unequal thigh folds. The LPN is reinforcing teaching with the parents about treatment to maintain the hips in a stable, flexed, and abducted position to promote proper joint development. Which device is most commonly prescribed to maintain this therapeutic position?