Posted by princess pum-punt on Friday, March 9, 2012 at 12:40pm.
AT around age 1 or 2.
Actually it begins at birth. I know a boy who was in an orphanage in a developing 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.
Oh, sorry.
between ages six and seven
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