4 months old baby because of the imperfect development of the nervous system, at the same time due to vitamin D supplementation will lead to easy to be frightened, as follows: 1, can be for vitamin D supplementation, daily to ensure adequate sunlight, mainly skin sunlight, sunlight for about 2 hours a day, to avoid sunburn eyes as well as cause skin damage can be. Vitamin D3 can be supplemented with 400 IU per day, alternating with vitamin AD, generally for about 3 months, the symptoms can be significantly improved. 2, in the day before the waking state or before the baby goes to sleep, the house should not be too loud, you can play some music in the house, are conducive to the stable recovery of the nervous system. At the same time, you can sleep before the auxiliary back spine on both sides of the chiropractic way to treat the state of shock, 1-2 times a day before going to bed, for about 3 days, repeated chiropractic action can make the state of shock significantly better.