Zinc deficiency in infants may result in growth and developmental disorders, anorexia and heterophagia, sexual developmental disorders, mental disorders and other symptoms, the specific manifestations of which vary from person to person. Zinc is an indispensable element for growth and development. Infants deficient in zinc mainly suffer from growth retardation, such as developmental disorders of bones, brain and internal organs; anorexia and xenophagia, such as loss of appetite and eating of inedible things; zinc deficiency may also lead to underdevelopment of the sex organs and breasts; mental disorders caused by zinc deficiency include inattentiveness, mental retardation, and unsteady walking. Zinc deficiency can lead to mental disorders including poor concentration, mental retardation, and unsteady walking. Zinc deficiency can also lead to low immunity, thinning of hair, and growth deformities. If symptoms of zinc deficiency occur, it is important to seek timely medical attention, take timely nutritional supplements, and eat a balanced diet.