Five-month-old babies generally do not need to supplement calcium, if the baby is deficient in calcium need to carry out vitamin D or calcium supplements. Usually, five-month-old babies whether breastfed or artificially fed (such as formula, etc.), which is rich in calcium, the baby’s normal milk can meet the needs of the baby’s growth and development, usually do not need additional calcium supplementation. However, if a five-month-old baby is diagnosed with calcium deficiency, showing symptoms of calcium deficiency such as restlessness, delayed closure of fontanel, excessive sweating, sluggishness, anorexia, night terrors, etc., it is necessary to start vitamin D supplementation as early as possible and take the child for more exposure to sunlight (direct sunlight should be avoided) to help the absorption of calcium supplements. If the baby still has calcium deficiency after the above treatment measures are used, calcium supplements, such as calcium gluconate oral solution, can be taken as prescribed by the doctor. If the five-month-old baby has symptoms of calcium deficiency, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor for clarification, do not arbitrarily give your baby calcium supplements, in order to avoid adverse consequences, affecting the normal growth and development of the baby.