Maternal calcium, phosphorus, and supplement intake before and during pregnancy and their association with preterm birth risk: based on a large cohort study

During the second and third trimesters of pregnancy, the intake of phosphorus and the use of calcium supplements should be increased. Additionally, to prevent premature birth, the intake of calcium should be increased preconception and during pregnancy. Furthermore, this might lead to the optimization of public health policies or the formulation of guidelines for prenatal nutrition.