How long a child needs to take zinc supplements needs to be determined by medical advice and according to the degree of zinc deficiency in the body. If the deficiency is only mild, supplementation for about a month will be sufficient, while more serious cases need to be supplemented for three consecutive months. Children with zinc deficiencies may experience decreased appetite, excessive sweating, thinning and yellowing of the hair. It is recommended to go to the hospital for a trace element examination, if the zinc deficiency is not serious, it is recommended that dietary supplements, eat more animal liver, beef, etc., generally about a month will improve; more serious cases need to take zinc supplementation drugs under the guidance of the doctor, need to be supplemented for about three months. Children with zinc deficiency supplementation for a period of time is recommended to the hospital for review, to avoid excessive supplementation, to the body to bring about adverse effects.