Low iron and anemia

What it is

Iron deficiency means your iron stores, measured as ferritin, are low. Anemia means your red blood cells, measured as hemoglobin, have dropped too. If you have been told you have low hemoglobin, or your provider mentioned an iron infusion, this is the topic.

Pregnancy needs a lot of iron. Your blood volume grows by nearly half. The baby builds its own blood and stores iron for the first six months of life. Your needs roughly double, and most women start pregnancy with low stores already.

About 1 in 5 pregnant women in the United States are anemic by the third trimester. Low ferritin without anemia is more common still. Bleeding at birth drops iron again, so postpartum anemia is common too. Low iron is linked to fatigue, low mood, poor sleep, and a harder recovery.

What's typical

Providers check hemoglobin at the first visit and again around weeks 24 to 28. Many now check ferritin too, and you can ask for it. Hemoglobin drops a little in mid-pregnancy for everyone, because plasma rises faster than red cells. That is expected.

Symptoms creep in: tired past what pregnancy explains, short of breath on stairs, a racing heart, dizzy when you stand, pale, cold, restless legs, and craving ice. Many mothers have no symptoms and find out from the lab. Iron stores take weeks to months to rebuild, so the earlier it is found, the better.

What's known

ACOG recommends screening all pregnant women for anemia and treating iron deficiency. Iron pills are the usual first step. Research now suggests an every-other-day schedule absorbs as well as daily with fewer stomach effects; ask your provider which form and schedule they suggest. IV iron, an infusion, is used when pills are not tolerated, when stores are very low, or when birth is close. Food matters: red meat, liver, shellfish, and dark poultry carry the form of iron your body absorbs best. Beans, lentils, and greens carry a form that absorbs better with vitamin C and worse with tea, coffee, or dairy at the same meal. Many postpartum food traditions, from Chinese liver soups to Korean seaweed soup, are built around rebuilding blood after birth.

What helps

• Ask for your ferritin number, not just whether you are anemic. Write it down and track it.
• Pair iron-rich foods with something sour: tomatoes, citrus, peppers, or a squeeze of lemon.
• Keep coffee, tea, and milk an hour or two away from iron, in food or pills.
• If iron pills upset your stomach, ask about a different form or schedule instead of quitting.
• After birth, plan for someone else to cook the iron-rich meals for the first weeks.

Who helps

Tools: Postpartum Meal Planner · Postpartum Prep Checklist

Related

• Iron-rich foods and how to absorb themPregnancy: Eating
• Anemia and exhaustion after birthPostpartum: Your Body
• Blood-building foods after birthNourishment and Traditions
• Exhaustion in the first trimesterPregnancy: Your Body
• Heavy bleeding after birth (hemorrhage)Birth and the First Days
• Constipation and hemorrhoids in pregnancyPregnancy: Your Body

Sources

• American College of Obstetricians and Gynecologists — Practice bulletin on anemia in pregnancy
• Lily Nichols RDN — Real Food for Pregnancy, chapter on iron
• WHO — Guideline on daily iron and folic acid supplementation in pregnant women
• CDC — Iron deficiency anemia in pregnancy fact sheet

Sources are named, not yet linked. The steward verifies each one and adds the link.