G3P2L2 at 40 weeks is in labour. The baby's head delivers but then retracts back against the perineum. McRobes maneuver is done to delivers the anterior shoulder.In postnatal period , the right arm is hanging & limp to the baby's side with the forearm extended and internally rotated. What is the likely reason ?
Erb palsy Klumpke's paralysis Humeral fracture Clavicular fracture