Causes of asymmetrical Moro's reflex?

The Moro reflex is an infantile reflex that develops between 28–32 weeks of gestation and disappears between 2-3 months of age. It is a response to a sudden loss of support and involves three distinct components: spreading out the arms (abduction) pulling the arms in (adduction) and startled look. *Asymmetrical moro's reflex: still present at 6 months  Causes:  Fracture of clavicles Fracture of humerus Erb's palsy