The baby’s arm is a small one, most of them may be related to congenital defects, such as bilateral development of the upper limbs asymmetry, but also may be related to vasculitis, loss of nerve atrophy and other factors.
1. congenital defects: baby arm a small, most of the congenital defects related to this situation belongs to the congenital bilateral development of the upper limbs asymmetric, may be the baby is still the fetal period, the pregnant woman has contact with radiation, chemical pollution of the environment, or the parents of heredity and other factors.
2. Vasculitis: Vasculitis is a group of diseases related to vascular necrosis and inflammation, this disease is related to the immune response, can involve any blood vessel in the body, the lumen is damaged may appear arm size.
3. Loss of nerve atrophy: Loss of nerve atrophy may be due to nerve damage, nutritional disorders caused by organs and so on, resulting in the nerve to its innervated tissues to play a functional as well as trophic role, there will also be the case of arm size.
The baby’s arm is big and small, there may be other reasons, it is recommended to go to the hospital in a timely manner to carry out relevant examinations, clear causes and then actively treat the symptoms.