Posted by Anonymous on Wednesday, June 27, 2012 at 10:45pm.
At birth.
I know a boy who was in an orphanage in a developing country until he was 6 months old. His neck muscles were weak probably because he hadn't had the freedom to crawl around; he was confined to a crib. Within a few weeks in an American home, his neck muscles strengthened.
this is the wrong answer it's not at birth
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