The Tonic Neck infant reflex is an automatic response that babies have up until about four months of age. If you turn a child's head to the side while he is lying awake on his back, he will reach one arm forward in the direction his eyes are pointing, and the other arm will flex.

Scientists don't really know why all newborns behave this way, but it may be a step in the development of the reaching and grasping motion.

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