A Primer on Erb's Palsy for the Lay Person
Erb's Palsy may result in varying degrees of weakness or paralysis of the shoulder, arm, wrist or hand, depending on the severity. Which part of the arm is involved depends on which nerves in this big network, or plexus, of nerves is injured. A baby with Erb's Palsy typically holds his arm limp, down by his side with forearm turned inward and wrist bent. The baby can't lift the arm up and doesn't bring it up even when s/he is startled. A baby with a very bad injury may also have a droopy eyelid on the side that was injured, in addition to an injury to his arm and hand.