Tone - Hand Position on Physical Exam
A newborn baby’s hand is held in a fisted position with the fingers flexed over the thumb. The hand should open intermittently and should not always be held in a tight fisted position. Rubbing the ulnar aspect of the hand or touching the dorsum of the hand will often cause extension of the fingers. Over the first 1 to 2 months of life, the baby’s hand becomes more open. Persistence of a fisted hand is a sign of an upper motor neuron lesion in an infant.
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