Every year in early spring, there is a sudden increase in convulsions and cramps in children. Especially in the winter and spring because of the cold weather, outdoor activities, less exposure to sunlight, the skin synthesis of vitamin D is not enough, if the breast milk is not enough or unwilling to feed at this time, it is more likely to lead to insufficient supply of vitamin D, affecting the absorption of calcium and phosphorus in the infant’s body, a series of convulsion symptoms. In the early stage of the disease, infants are often prone to night terrors, irritability, sweating, restless sleep, crying, jumping, shaking their heads, etc. The seizures are characterized by three typical symptoms: feverless convulsions, hand and foot twitching and laryngeal spasms, especially laryngospasm, which can endanger the life of the infant in severe cases. Therefore, once found, they should be sent to hospital immediately. The key to preventing this disease is to stock and supplement the infant with adequate amounts of vitamin D. Specific measures are: Pregnancy prevention Pregnant women whose due dates are in the winter and spring seasons should spend more time outdoors during pregnancy and usually get more sunlight. Especially in late pregnancy, take an appropriate amount of cod liver oil daily to store a certain amount of vitamin D in the fetus. Sunbathe frequently One month after the birth of the baby, depending on the weather and daylight, you can carry the baby to sunbathe outdoors or on the balcony every day, but be careful not to sunbathe through the glass. Early prevention and control Newborn babies, especially those born in winter, can take 1 drop of concentrated cod liver oil every day from the 3rd-4th week after birth, and increase it to 3-5 drops after gradual adaptation, while supplementing with appropriate amount of calcium powder, but not more than 0.5 grams per day.