Calcium helps build the baby’s strong bones and teeth and prevents osteoporosis in mom. Your growing baby needs a considerable amount of calcium to develop. If you do not consume enough calcium to sustain the needs of your developing baby, your body will take calcium from your bones, decreasing your bone mass and putting you at risk for osteoporosis. You need lots of calcium both while you’re pregnant and while you’re breastfeeding. Vitamin D, magnesium, and vitamin K all work together to help your body absorb calcium. Calcium and magnesium also help regulate blood pressure and could help prevent preeclampsia. Best Sources: Grass-fed organic dairy products such as yogurt, cottage cheese, and some cheeses, sardines, spinach, broccoli, and collard greens.