Pregnancy and breast feeding put demands on your calcium needs. You don't need more calcium when you are pregnant or breast feeding but it is much easier to become deficient during these times. If you aren't getting the 1000 mg RDA of calcium a day, your body will take what it needs from your bones to provide for your baby. Consume 3-4 calcium containing foods each day such as cottage cheese, milk (or the chocolate version if you prefer!), yogurt, cheese, calcium fortified orange juice or a LUNA bar.