Leaky gut is a congenital disorder and usually has a family history. Therefore, the following preventive measures should be taken: 1. At the end of pregnancy, the mother should pay attention to nutrition, eat more eggs, animal liver and other foods rich in vitamin D and protein, get sunlight frequently, and take vitamin D and calcium supplements under the guidance of a doctor; 2. Newborn babies should be breastfed as early as possible, as the vitamin D in breast milk is more easily absorbed. Half a month after birth, babies should take vitamin D and calcium under the guidance of a doctor; 3. After the baby is full term, the sunshine time can be gradually increased. In summer, avoid direct sunlight and play in the shade; 4, 4 months to add supplementary food, not cereal-based food, so as not to affect the absorption of calcium salts in the diet.