1, the baby was not born to start prevention Pregnant mothers should often go out in the sun, diet rich in VD and calcium food. From the fifth month of pregnancy, supplement VD and calcium, so that you can avoid the baby in the mother’s womb to suffer from congenital rickets, especially the cold north should pay more attention to calcium supplementation. 2, scientific feeding after birth Adhere to breastfeeding, breast milk should try to feed the baby more than 6 months. During this period, the mother should pay attention to more calcium-rich diet, while supplementing calcium supplements containing VD. Formula milk has a more appropriate calcium-phosphorus ratio and is rich in calcium, so as long as the baby eats a normal amount of food, the calcium requirement can be met. 300mg of calcium per day for babies under 6 months, 400mg per day for babies aged 6 months to 1 year, and 600mg per day for babies aged 1 to 3 years. Mothers can calculate according to the amount indicated by formula milk, and the insufficient calcium should be supplemented from calcium supplements. 3.Timely add supplemental food according to the age of the month Food in the egg yolk, liver VD content is more. When the baby is 4 to 5 months old, you can give the baby cooked egg yolks, and when the baby is 7 months old, you can add porridge with pig liver or sheep liver. Milk, dairy products and seafood rich in calcium, easily absorbed in the intestinal tract, to the baby’s stomach and intestines can be digested at the age of months, you can give your baby to eat more calcium-rich complementary foods. 4, more with the baby sunshine After the baby was born, to often take him to the outdoor sunshine, generally no less than 2 hours a day, morning and afternoon each time. When the sun is strong, the baby can be brought to the shade, or avoid the sun is stronger time to go out in the sun, the same can make the baby body to get ultraviolet radiation, increase the amount of VD conversion in the body. 5, timely supplementation of VD after birth Premature, twin babies, should be 1 ~ 2 weeks after birth to start supplementation of VD, full-term babies should be 2 ~ 4 weeks after the start. Under normal circumstances, babies under 6 months of age should be supplemented with 400 international units per day, and babies over 6 months of age should be supplemented with 400-600 international units per day. The ideal method of calcium supplementation is to take VD and calcium supplements separately. This kind of product should use VA and VD ratio of 3:1 preparation, such as Betelin gel pills, Icosin, Cola Bebedo, etc., are more suitable for babies to take. Intimate reminder: in the sunny summer, if the outdoor activities, more than 1 year old babies can not take VD, so as to avoid the accumulation of VD in the body caused by poisoning.