Calcium deficiency in newborns can lead to a variety of problems such as poor bone development and developmental delays, and therefore needs to be supplemented according to their health conditions. Usually, newborns are provided with sufficient calcium during the months they are in the mother’s womb and do not need to take additional calcium supplements. In general, infants do not need to take additional calcium supplements as long as they take their vitamin D supplements and have normal milk intake. However, some pregnant women do not pay much attention to their own calcium supplementation during pregnancy, the body may have a calcium deficiency, which will also directly affect the newborn’s calcium content after birth, such babies often have calcium deficiency, in addition, many premature babies are also susceptible to calcium deficiency, the child may have a softening of the cranial bones and other manifestations of the need to take supplements. Often newborns with a calcium deficiency will show signs such as slight twitching of the arms and legs, and if the child is confirmed to have a calcium deficiency, calcium supplements can be utilized. Vitamin D supplementation is also needed, and the child should not be taken out in the sun. Most newborns do not need additional calcium supplements, but if there are symptoms of calcium deficiency and the deficiency is detected, supplements should be given accordingly to avoid affecting development.