Vitamin C deficiency, also known as scurvy, is caused by a lack of vitamin C. Clinical features are characterized by bleeding and bone lesions. The human body cannot synthesize vitamin C by itself, all vitamin C must be obtained by food, but the good thing is that people live in a variety of fresh vegetables, fruits are rich in vitamin C, but all breast-fed and can add some vegetables, fruit supplements, are very difficult to suffer from this disease. It is unimaginable and unforgivable for any mother to feed her baby to a vitamin C deficiency. Vitamin C deficiency is caused by the following factors: 1. Insufficient intake: all breast-fed babies can meet the needs of vitamin C, while the vitamin C content of cow’s milk is only 1/4 of human milk, and then after storage, dilution, processing, sterilization and sterilization, its vitamin C content is very little left. Therefore, infants fed with milk, milk powder, milk cake, rice and flour paste alone can suffer from inadequate intake if they are not supplemented with fresh vegetables and fruits in a timely manner, or if they are partial eaters. 2, absorption disorders: absorption of vitamin C is reduced in the case of indigestion and chronic diarrhea, and vitamin C is easily destroyed in the gastrointestinal tract when there is a lack of stomach acid. 3.Increased consumption: when suffering from infectious diseases, fever, high metabolic diseases, the consumption of vitamin C increases, and the supplement cannot keep up, resulting in more consumption than intake. 4, improper food processing: high temperature heating, alkaline environment can lead to vitamin C damage, so vegetables and fruits stored too long, high temperature heating too long will cause vitamin C deficiency. The performance of vitamin C deficiency: Vitamin C deficiency patients will feel tired, general weakness, weakness, anorexia, malnutrition, pale, anemia, swollen gums, bleeding, and can be caused by gum and alveolar necrosis and loose teeth, loss of bone and joint muscle pain, skin petechiae, petechiae, hyperkeratosis of hair follicles, bleeding around, children can be caused by subperiosteal bleeding and pseudo-paralysis of the lower limbs, swelling, pressure pain is obvious. The hip joint is abducted, the knee joint is semi-flexed, the foot is externally rotated, and the frog-like posture is present. This disease is extremely easy to prevent, the method is simple and feasible 1, adhere to breastfeeding 2, according to the plan to add supplementary food, rich in vitamin C food: persimmon pepper, bitter melon, cauliflower, kale, bok choy, spinach, tomatoes, radish, potatoes, sweet potatoes, sour dates, hawthorn, Sha Tin grapefruit, prickly pear, sea buckthorn, kiwi, apple, strawberry, pineapple. 3, increase supplementation during illness.