All are true regarding fetal skeletal mineralization except
Fetal calcium requirement is only 3 % of total calcium held within maternal skeleton.
Approximately 30g of calcium is needed especially during 3rd trimester.
Calcium required by fetus is only 10 % of maternal, skeletal calcium.
Amount of calcium absorbed increases to 400mg / day in the third trimester.
PTH plasma concentration is decreased in first trimester, but increases progressively later.