The need for calcium, iron and zinc supplements for one-year-old babies should be determined on a case-by-case basis. If the child is deficient in calcium, iron and zinc, he/she needs to be instructed by the doctor to take calcium, iron and zinc supplements; on the contrary, there is no need to take calcium, iron and zinc supplements. If a one-year-old baby has poor diet, excessive partiality, picky eating, poor appetite and other manifestations, you should promptly take the baby to the hospital for the relevant elements of the test, according to the results of the test for the appropriate elements of supplementation. If the baby lacks one or more of the elements of calcium, iron and zinc, targeted supplementation is required. The need to follow the doctor’s advice to supplement vitamin D3, iron succinate oral solution, lysine glucosamine zinc granules and other drugs, to help improve the baby’s uncomfortable performance. If your one-year-old baby’s calcium, iron and zinc levels are within the normal range, no supplementation is needed. If the baby’s body is not deficient in calcium, iron and zinc, and parents blindly give the baby calcium, iron and zinc supplements, it is not beneficial to health. Parents are advised to arrange the child’s diet reasonably and have a balanced meal. When the one-year-old baby has obvious discomfort, it is recommended to consult a doctor as soon as possible to clarify the diagnosis and carry out targeted treatment. All of the above drugs should be used under the guidance of a doctor.