In Duchenne muscular dystrophy, lack of head control typically appears by what age?

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Multiple Choice

In Duchenne muscular dystrophy, lack of head control typically appears by what age?

Explanation:
Proximal weakness from Duchenne affects muscles needed to hold the head up, especially the neck extensors and trunk stabilizers. The head needs to be held erect against gravity by about four months in typical development. When head control is lacking that early, it reflects this early proximal involvement seen in Duchenne. Therefore, lack of head control typically appears by around four months. If head control is delayed later, such as around seven months or beyond a year, that pattern is less characteristic of Duchenne in infancy and suggests other issues or a more advanced, different presentation.

Proximal weakness from Duchenne affects muscles needed to hold the head up, especially the neck extensors and trunk stabilizers. The head needs to be held erect against gravity by about four months in typical development. When head control is lacking that early, it reflects this early proximal involvement seen in Duchenne. Therefore, lack of head control typically appears by around four months.

If head control is delayed later, such as around seven months or beyond a year, that pattern is less characteristic of Duchenne in infancy and suggests other issues or a more advanced, different presentation.

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