Anemia in pregnancy can be caused by nutritional deficiencies and physiological hemodilution.

“anemia and pregnancy go hand in hand but i don't think there's a lot of people that talk about the reason why they go hand in hand and the part of the reason is yes there's probably lots of different deficiencies because we're not eating for optimal nutrition for the last hundred years because we've moved away from that farm to table type of of eating but the hemodilution that happens in pregnancy lowers those hemoglobin levels because of the blood diluting throughout the pregnancy”