A nurse is teaching a group of parents about expected development of gross motor skills during infancy. The nurse should teach that the following developmental tasks are expected to occur in what order? (Move the steps into the box on the right, placing them in the order of performance. Use all the steps.)

D. Rolling from back to side is the earliest movement and reflects initial development of trunk rotation and muscle control. This typically occurs around 4 months of age. C. Rolling from back to abdomen requires greater coordination and strength than rolling to the side and usually occurs around 5 to 6 months as infants gain better control of their core muscles. A. Sitting steadily unsupported develops once the infant has strong trunk control and balance, typically around 6 to 8 months. This skill indicates improved postural stability. B. Changing from prone to sitting is the most advanced skill listed. It requires coordinated use of the arms, core, and balance, and typically occurs later around 8 to 10 months as mobility becomes more purposeful.