Not only does this mean they miss out on key nutrients, this also puts them at risk for poor bone density, obesity, and type 2 diabetes. (whattoexpect.com)
Due to their size, and in some lineages poor bone density, they are prone to broken legs. (en.wikipedia.org)
Postpartum deficiency can cause: postpartum depression, poor bone density, lowered calcium absorption (ohbabynutrition.com)