Unable to stand from the supine position at ___ months in Duchenne muscular dystrophy development?

• A. 12 Months
• B. 4 Months
• C. 7 Months
• D. 15-18 Months

Answer: (A)

In Duchenne muscular dystrophy, proximal muscle weakness leads to delays in early gross motor milestones, especially those involving standing up from the floor. As this weakness progresses, a child would fail to stand from a supine position around the first year of life. That’s why the age of about 12 months best fits the pattern: it reflects the onset of difficulty rising from the floor due to hip and thigh muscle weakness before more advanced walking loss occurs.

Options that are clearly earlier or later don’t align with the typical progression seen in Duchenne. Very early ages (like 4 or 7 months) would be before the normal window for standing development in any child, and waiting until 15–18 months would miss the expected early sign of proximal weakness that characterizes Duchenne.