The best time to take calcium supplements for newborns is about 4 months after birth, and it is best to take calcium supplements 30-60 minutes after dinner. Because newborns begin to teethe and develop faster at 4 months of age, they have a greater need for calcium and are therefore in the best position to take calcium supplements at this stage. However, some newborns may experience nausea, vomiting and diarrhea after taking calcium supplements. Taking calcium supplements after meals can reduce the stimulation of the gastrointestinal tract, and more gastric acid is secreted after meals, which can fully decompose calcium into calcium ions and facilitate calcium absorption. In addition, the body mainly absorbs calcium at night. Therefore, taking calcium supplements about one hour after dinner is more conducive to absorption. In addition, calcium supplements can be combined with vitamin D. Vitamin D is beneficial to calcium absorption and utilization, and newborns can be taken outdoors to receive appropriate ultraviolet radiation to promote calcium absorption.