The child’s startle reaction is particularly strong may be nutrient deficiencies, central nervous system damage, etc., and should be promptly consulted to find out the cause of the disease. 1. Nutrient deficiencies: due to the lack of timely supplementation of vitamin D and calcium, or poor absorption of the above substances caused by rickets, which may lead to increased excitability of the central nervous system, thus causing the baby’s startle response to aggravate. 2. Central nervous system injury: there may be ischemic-hypoxic encephalopathy attack or encephalitis, toxic encephalopathy, can lead to the baby’s central nervous system excitability increases, thus causing the startle reaction aggravated. If the child’s startle reaction is particularly strong, parents are advised to take the baby to the hospital as soon as possible for examination, and the doctor will give targeted treatment after clarifying the cause of the disease.