When supplementing calcium for babies, certain things need attention. First, ensure the baby's diet includes enough calcium-rich foods like dairy products, tofu, and green vegetables. Second, don’t blindly give calcium tablets; it's best to consult a doctor. Excessive calcium can cause constipation or other health issues. Also, Vitamin D is crucial for calcium absorption, so make sure the baby gets enough sunlight or supplements Vitamin D through food. Lastly, moderate exercise also helps maintain bone health.