1. Symptoms of calcium deficiency in infants What are the symptoms of calcium deficiency in infants? The main symptoms are muscle stiffness, twitching of hands and feet, restless sleep, loss of appetite, etc. If your baby has these symptoms, he should go to the hospital for examination in time. 2. How to supplement calcium for infants 1. Feed foods rich in calcium: Both breast milk and formula milk powder are rich in calcium, which can meet the growth and development needs of the baby. 2. Supplement vitamin D: Vitamin D can