A. Femur: The femur is not typically involved in birth-related trauma during shoulder dystocia. This long bone is located in the thigh and is relatively well protected during delivery, making it an unlikely site for injury in this context. B. Humerus: While the humerus can occasionally be fractured during difficult deliveries, especially if excessive traction is applied, it is less commonly injured than the clavicle during shoulder dystocia. Fractures of the humerus are usually secondary to more forceful maneuvers or malpositioning. C. Clavicle: During shoulder dystocia, the baby's anterior shoulder gets stuck behind the mother's pubic bone. The clavicle is the most commonly fractured bone. Fracture can occur as a natural mechanism to reduce shoulder width or may result from delivery maneuvers, and it often facilitates passage of the shoulder through the birth canal. D. Skull: Skull fractures are rare in shoulder dystocia because the head is typically already delivered by the time the dystocia is recognized. Skull fractures are more often associated with instrumental deliveries or cephalopelvic disproportion rather than shoulder entrapment.