Erbs Palsy or Brachial Plexus Palsy is caused by traumatic stretching of the infant's shoulder during birth. Erbs Palsy affects a bundle of five nerves known as the brachial plexus, which control muscles in the shoulder, arm, and hand. The result is paralysis in these muscles, diminished muscle control or no feeling in the arms or hands. Some sufferers of Erbs Palsy can move their arms, but have little control over the wrist and hand. Still others can use their hands well, but cannot use the shoulder or elbow.

When the initial shock wears off, parents want answers. They want to know what went wrong and if this tragedy could have been prevented. Sometimes, an investigation will reveal that the outcome could not have been prevented.