Rickets, commonly known as calcium deficiency, is more common in infancy and is a disease caused by vitamin D deficiency that disrupts calcium and phosphorus metabolism in the body, resulting in poor bone calcification. Rickets develops slowly and is not easily noticed. Rickets reduces the resistance of children and can easily be combined with pneumonia and diarrhea, affecting the growth and development of children. So rickets has the symptoms? 1, difficult to fall asleep, like to hold, put down and wake up, night crying; 2, hair thinning, occipital bald circle; 3, late teething or uneven teething; 4, square cranium, chicken chest, rib arch, “X”, “O” leg; 5, intelligence, language, motor development is backward; 6, short stature; 7, easy to develop. 6. short stature; 7. irritability, agitation, hand and foot twitching; 8. low immunity, easy to repeated respiratory infections; 9. more sweating, independent of temperature. The performance of calcium deficiency in children varies, parents should judge whether their children are deficient according to their performance, so that they can make up calcium in time to reduce the symptoms when they are deficient. In terms of diet, give your child more calcium-rich foods, such as fish, shrimp, kelp, bone broth, etc. Also, eat foods rich in vitamin D, such as animal liver, to promote the absorption of calcium. At the same time, parents are advised to take their children to appropriate outdoor activities, more sunshine, around 10 am and 3 or 4 pm, for half an hour each time. The ultraviolet rays in sunlight can transform subcutaneous T-dehydrocholesterol into vitamin D3, which can promote the absorption of calcium in the body. If the symptoms of calcium deficiency are serious you should go to the hospital for calcium supplementation under the guidance of a doctor. Of course, there are many kinds of cod liver oil preparations suitable for children to eat, generally recommended to use drops or water, children over one year old can choose a larger range, such as granules or tablets. Some parents may say, “My baby is already taking calcium supplements, why is he still deficient in calcium? There is a difference in concept here. Rickets is known as calcium deficiency, but in fact it is a deficiency of vitamin D, which promotes the absorption of calcium. So calcium supplementation alone will not achieve the desired effect.