Calcium deficiency in babies is a common symptom in childhood, so it is not necessary to be overly nervous or not to pay attention to it, and it is necessary to give babies reasonable calcium supplement according to the doctor’s guidance. The common symptoms of calcium deficiency in infants include difficulty in falling asleep, unsteadiness after falling asleep, especially night terrors and night cries at night, often waking up suddenly during the night and crying. After falling asleep, the baby’s head sweats a lot, and sweats a lot at night, and sweats more obviously after crying. Due to the itchy back of the head caused by sweating, the baby’s head will rub against the pillow, causing the phenomenon of pillow baldness in the back of the head. Strange temperament, abnormal temperament, will appear irritable, crying, fidgeting and other symptoms. Late teething, some children are still not teething when they are more than 1 year old, while some children have unevenly arranged and stunted teeth, improper bite, easy to loosen and detach from your too early. Physical abnormalities may also occur, such as high forehead protrusion and formation of a square skull. The cartilage of the rib cage is enlarged and often presses on the lungs, and the baby may have a feeling of poor ventilation. Growth and development will be delayed, and in serious cases, the baby will only stagger after the age of 1 year, while the bone will be softened, there will be “X” shaped legs or “O” shaped legs, muscle weakness, leg bone pain. Due to the low immunity of the body, it is easy to suffer from bronchitis, pneumonia and other diseases, and if it develops into a serious calcium deficiency, it may lead to rickets. Parents should understand the different degrees of calcium deficiency in infants, comprehensive judgment of the degree of calcium deficiency, do not abuse calcium drugs, to avoid making babies miss the best time to supplement calcium.