According to the World Health Organization, breast milk already provides adequate dietary calcium for infants, and the calcium content of formula is based on breast milk as a reference, so there is no need to be concerned about calcium deficiency in babies who drink breast milk normally from 0-6 months of age.
Premature babies are unique, and the American Academy of Pediatrics recommends calcium and phosphorus supplements, as well as special supplements designed for premature babies, in addition to vitamin D supplements.
The calcium intake recommendation for babies this age is 250 mg per day, a slight increase from 0-6 months.
The American Academy of Pediatrics recommends that babies at this age be fed primarily breast milk or formula, with a reasonable mix of cereals, vegetables, meat, yogurt, juice, and other supplements.
Calcium is found in yogurt and low-oxalate cabbage, broccoli, and kale, and these foods can easily meet the calcium intake target.
Over 1 year old
You should make sure your child's milk intake to 400-600mL per day for children aged 1-3 years old and 300-600mL per day for children aged 3 and up. Then focus on eating tofu, eggs, vegetables, meat, and so on.
Some parents may find it difficult to calculate their child's daily diet: how much of this to consume, and whether that consumption is sufficient. They believe that taking calcium supplements directly is preferable.
However, a well-matched supplement for your child will provide not only calcium but also other nutrients that promote your child's development and good habits of a balanced diet.