1. Manifestations of calcium deficiency in infants 2. Causes of calcium deficiency in infants 3. Harm of calcium deficiency in infants 4. How to prevent and treat calcium deficiency in infants 1. Manifestations of calcium deficiency in infants 1. Skeletal dysplasia: rickets or osteoporosis And other issues. 2. Muscle weakness: manifested as twitching of hands and feet, or even facial twitching. 3. Decreased immunity: prone to bacterial and viral infections, respiratory tract infections