If it is calcium deficiency, you should take vitamin D instead of calcium tablets, unless the calcium content in his milk and complementary food is seriously insufficient, which is rare.

Moderate sun exposure can also promote the absorption of calcium.

Calcium and milk cannot be taken at the same time, which will affect absorption.

Calcium in calcium tablets may react with a substance in milk powder to produce calcified substances that are not easily absorbed, which will affect the absorption of calcium. It's best to eat at different times.