(1) Preferring to eat dirt, cinder, paper, wall skin, egg skin, etc. In other words, the preference for eating non-food foreign objects is medically known as xenophagia. (2) Long-term loss of appetite, anorexia, refusal to eat. (3) Slow growth rate, but hereditary diseases and certain drug poisoning should be excluded. (4) Recurrent oral ulcers are also a symptom of zinc deficiency. (5) Frequent respiratory and digestive tract infections, no less than 10-12 times a year. (6) There are extremity dermatitis, chronic eczema, acne, and traumatic surface does not heal easily after trauma. The above symptoms are common clinical manifestations. If necessary, you can go to the doctor to determine the level of zinc in the body, which will help in the diagnosis of the disease. The easiest way to prevent zinc deficiency in children is to emphasize breastfeeding, as human colostrum contains a large amount of zinc, and as the months grow, the zinc content of the final milk decreases. Cow’s milk contains no less zinc than human milk, but it is more difficult to absorb, which shows the benefits of human breastfeeding even more. As babies continue to grow and develop, there is a need to enrich the variety of pediatric foods, and single foods often cause zinc deficiency. Animal foods in general have a higher zinc content than plant foods, except for fat and protein. In particular, sea shellfish is richer. Among plant foods, kelp and nori are the most abundant, while beans and nuts such as peanut rice also have some content, and fruits contain less. The absorption rate of zinc in plant foods is 10%-20% or less, while the absorption rate of zinc in animal foods can be 35-40%. Children can get enough zinc if they eat whole grains, nuts, meat and seafood.