From a professional point of view, this disease should be called vitamin D deficiency tetany, which is a special symptom of vitamin D deficiency rickets in small infants, mostly seen in infants with poor nutritional status over six months. The compensatory insufficiency of the parathyroid gland caused by vitamin D deficiency reduces the concentration of calcium ions in the blood, and then increases the excitability of the neuromuscles, causing twitching of the muscles of the whole body. However, these convulsions are different from those of children with febrile convulsions and epileptic seizures. In addition, these children will have laryngeal wheezing when inhaling, and in severe cases, there can be a risk of asphyxiation. It is important to prevent rickets and to give him vitamin D supplements after birth to prevent vitamin D deficiency.