Pediatrics Rehabilitation Exam 2 Practice

Duchenne muscular dystrophy causes delayed gross motor milestones because of proximal muscle weakness, so independent walking is achieved later than normal. In this condition, walking without assistance is typically not reached until about 15–18 months, which is later than the typical 12-month milestone. The other options reflect earlier or normal development (4–7 months or around 12 months), which do not fit the pattern of delay seen in Duchenne. Therefore, the 15–18 months range best matches the expected delay in independent ambulation.