3. Pregnancy
3.1. Normal adaptations
The human fetal skeleton contains on average 30 g of calcium at
term. About 80% of that calcium is accreted during the third trimester
when the placenta actively transports calcium at 110e
120 mg/kg per day. Much of the calcium in the fetal skeleton
derives from the maternal diet during pregnancy, enabled by twofold
increased intestinal calcium absorption that begins in the first