3 months old baby hands always make a fist, to pay attention to the possibility of brain injury syndrome, in normal 3-4 months old baby hands should often be in the open state, if often hands make a fist and accompanied by breastfeeding difficulties, vertical head instability, head easily tilted back, the body to fight, limbs stiff as a stick or too floppy, to the children’s rehabilitation department in time to the clinic, if necessary, for cranial nuclear magnetic magnetic and other related examinations and early rehabilitation training. In addition, if the baby’s vertical head stable, can interact with people’s eyes, expression sensitive may be purely because of the hand of the wrist extensor muscle strength caused by low, you can go to the children’s rehabilitation department to local give intramuscular effect of the paste sticking, at the same time, knocking the back of the hand to exercise, it is best to go to the hospital for professional guidance.