Usually what we call calcium deficiency, medically known as vitamin D deficiency rickets, the impact on the baby is mainly bones are not strong and easy to deform, affecting the beauty and function, a few can lead to immune deficiency, inattention, intellectual backwardness. How to prevent rickets, there are the following points mothers to do: 1, more sunshine, to ensure 1 to 2 hours of outdoor activities every day, fully exposed skin and sunlight contact, through the glass sunshine is not the solution. 2, advocate breastfeeding, but the need to add complementary foods in a timely manner, timely weaning, 1 year after the nutritional value of breast milk is greatly reduced, must add a comprehensive and balanced nutrition. 3. Mothers in late pregnancy, after 7 months of pregnancy, need to add vitamin D 400 to 800 units per day. 4. Babies after birth, 21 days after birth, take vitamin D, 400 units per day, summer May to October baby can go out in the sun, you need to stop taking the drug until 2 weeks of age to stop the drug. Premature babies need to be treated separately. Did you remember, dear mother?