Children with mild hypocalcemia may have symptoms such as twitching or numbness of hands and feet, irritability and crying; if it is moderate to severe hypocalcemia, it may lead to weakening of resistance and changes in bones. It is necessary to follow the doctor’s advice to actively carry out the treatment. 1. Mild calcium deficiency (1) Hand and foot twitching: Calcium has the effect of reducing nerve and muscle excitability, so if children have hypocalcemia, it will cause nerve cell sensitivity to increase, and hand and foot twitching will occur. (2) Numbness of hands and feet: If children have hypocalcemia, it will lead to lack of calcium in the blood, which will cause vascular spasm, resulting in insufficient blood supply to local tissues, and the symptoms of numbness of hands and feet will appear. (3) Irritability and crying: When a child is mildly deficient in calcium, the child may have great changes in mood, such as being easily irritable, crying and easily awakened during sleep, and the child’s hair may be yellow and fine. 2. Moderate to severe calcium deficiency (1) Weakened resistance: When your child is moderately or severely deficient in calcium, your child’s resistance will be weakened, and he or she will catch colds easily and learn to walk later than children of the same age. (2) Changes in bones: When a child is severely deficient in calcium, it will have a great impact on the development of the child’s bones, which may result in loopy legs, hunchback, muscle weakness and other conditions. When a child has low calcium, close attention should be paid to whether the child has the above symptoms. If the symptoms are present and have not been relieved, it is recommended to pay attention to them, consult a doctor for examination in a timely manner, and follow the doctor’s instructions for treatment.