WebMay 14, 2024 · The amount of calcium you need each day depends on your age and other factors. The recommended amounts, in milligrams (mg), are: Birth to 6 months: 200 mg. Infants 7-12 months: 260 mg. Children 1-3 years: 700 mg. Children 4-8 years: 1,000 mg. Children 9-13 years: 1,300 mg. Teens 14-18 years: 1,300 mg.