What role does calcium play during pregnancy?

Calcium is essential during pregnancy primarily because it plays a critical role in bone development for both the mother and the growing fetus. During this period, the mother's body requires additional calcium to support the formation of the baby's bones and teeth, as well as to maintain her own bone density.

When pregnant, a woman's calcium needs increase, and her body draws on calcium deposits stored in her bones if dietary intake is insufficient. This dynamic illustrates the importance of calcium not just for the structural integrity of bones but also in providing the necessary nutrients for fetal development. Ensuring adequate calcium intake can help prevent complications such as low bone density in mothers after giving birth and supports the overall health of the baby.

The other choices address various health aspects but do not reflect the primary role of calcium during pregnancy. Regulating blood pressure, improving digestion, and increasing energy levels are influenced by other nutrients and hormones, but calcium's fundamental function in this context is specifically related to bone health and development.