A nurse is caring for a 10-month-old infant who is in a cast for developmental dysplasia of the hip (DDH). Which of the following strategies should the nurse implement to promote the infant's growth and development?

A. Standing in the crib could harm the cast or the infant's healing. B. A small electronic toy is age-appropriate and can promote cognitive and sensory development. C. Changing diapers promptly is necessary but does not promote growth and development. D. Latex balloons are a choking hazard and should be avoided.