Everyone expects to be tired with a newborn. That is the deal, and you knew it going in.

But there is a particular kind of tired that goes beyond it. The kind where you are breathless walking upstairs. Where your heart races when you stand up. Where you feel foggy and grey in a way that sleep, when you occasionally get some, does not touch.

Postpartum anaemia is common, frequently missed, and genuinely treatable. If you are more than newborn-tired, it is well worth ruling out properly.

Why iron drops after birth

Three things stack up, and most women experience at least two of them.

Blood loss at delivery. Average blood loss is around 300 to 500ml for a vaginal birth and roughly double that for a caesarean. If you had a postpartum haemorrhage, defined as over 500ml, the losses are considerably higher. Every millilitre takes iron with it.

Pregnancy demand. Your baby draws iron from you throughout pregnancy, particularly in the third trimester when they build their own stores for the first six months of life. Your body prioritises this, which is generous of it and costly for you.

Breastfeeding. Ongoing demand, alongside the fact that many women simply eat less well in the postpartum months because eating properly is genuinely hard with a newborn.

Add that many women enter pregnancy with modest stores to begin with, and it is easy to see why postpartum anaemia affects a meaningful proportion of new mothers.

Anaemia in pregnancy covers building those stores up before birth, which is the single most useful thing you can do for the version of you reading this afterwards.

Postpartum anaemia symptoms, beyond tiredness

Exhaustion is the obvious one, and also the least useful, because everyone assumes it is just the baby. These are the symptoms worth paying attention to.

• Breathlessness on stairs or during ordinary activity that never used to affect you
• Heart palpitations or a racing heart, particularly when standing
• Dizziness or lightheadedness, especially standing up quickly
• Persistent brain fog that goes beyond sleep deprivation
• Cold hands and feet, feeling cold when others are comfortable
• Restless legs at night, which has a strong association with low iron
• Hair loss beyond the usual postpartum shedding
• Pale skin, particularly noticeable inside your lower eyelids
• Headaches
• Unusual cravings, particularly for ice, which is called pica and is a recognised sign
• Feeling low or anxious, since iron deficiency has genuine associations with postnatal mood

Any one of these on its own has other explanations. Several together, particularly breathlessness and palpitations, deserve a blood test rather than a shrug.

Our article on postpartum hair loss covers the overlap here, since low iron frequently sits underneath shedding that is heavier or longer than expected.

Ferritin and haemoglobin are not the same thing

This is the single most useful thing in this article, so please do read this bit properly.

When your GP runs a full blood count, they are measuring haemoglobin, the protein in your red blood cells that carries oxygen. If haemoglobin is low, you have anaemia.

But haemoglobin is the last thing to fall. Your body will run down its stored iron first, protecting circulating haemoglobin for as long as it possibly can.

Ferritin measures those stores. And ferritin can be genuinely depleted while your haemoglobin still looks entirely normal.

This is why so many women are told their bloods are fine while feeling dreadful. The test that was run was not the test that would have shown the problem.

What this means for you. If you are exhausted and your full blood count came back normal, that does not rule out iron deficiency. Ask specifically for a ferritin test, and ask for the actual number rather than being told it is within range.

The reference ranges are wide, and the bottom end is low. A ferritin of 15 is technically within many lab ranges, but most practitioners would consider that genuinely depleted, particularly with symptoms. Many suggest symptoms of deficiency can occur below around 30, and that somewhere around 50 or above is a more comfortable place to be, particularly if you are breastfeeding or experiencing hair loss.

Knowing your number lets you have a sensible conversation. Being told “normal” tells you almost nothing.

What to ask your GP to test

Worth going in with a specific list, since these are not always run together.

Full blood count, which shows haemoglobin and gives a picture of your red blood cells.

Ferritin, the crucial one, showing your stores. Ask for the number.

B12 and folate, since deficiency in either causes anaemia and exhaustion that looks identical to iron deficiency, and both are common postpartum.

Thyroid function, because postpartum thyroiditis affects around five per cent of women, typically between four and twelve months after birth, and causes exhaustion, hair loss and mood changes that are constantly mistaken for normal new motherhood.

Something worth knowing: ferritin rises with inflammation or infection, so if you are unwell when tested, the result can look falsely reassuring. If your ferritin is borderline and you feel dreadful, retesting when well is reasonable.

Iron-rich foods that are realistic with a newborn

There are two kinds of dietary iron, and the distinction genuinely matters.

Haem iron, from animal sources, is absorbed far more efficiently, somewhere around fifteen to thirty-five per cent. Red meat is the standout, alongside liver, which is exceptionally iron-rich, plus poultry, sardines and other oily fish.

Non-haem iron, from plants, is absorbed at only around two to twenty per cent, so it needs more help. Lentils, chickpeas and beans, dark leafy greens, pumpkin seeds, tofu, dried apricots, and fortified cereals.

What actually gets eaten with a newborn. Be realistic. Tinned lentils stirred into anything. Pumpkin seeds scattered on whatever you are already having. Dried apricots in the snack box. A fortified breakfast cereal, which is often more achievable than a cooked breakfast. Beef mince in a batch-cooked bolognese or chilli that lasts three meals.

Perfection is not the goal. Consistency is.

Helping your body absorb it

This is where you get the most benefit for the least effort, particularly with plant sources.

Pair with vitamin C. This is the big one. Vitamin C substantially increases absorption of non-haem iron, in some studies by several-fold. Squeeze lemon over lentils. Add peppers to a bean stew. Have fruit alongside a fortified cereal. Tomatoes with anything.

Keep tea and coffee away from iron-rich meals. The tannins in both significantly inhibit absorption, and the effect is substantial. Leave an hour either side of a meal where you are trying to get iron in. Given how much tea new mothers drink, this one detail can make a real difference.

Watch calcium timing. Calcium competes with iron for absorption, so a large glass of milk alongside an iron-rich meal works against you. Separate them where you can.

Cook in cast iron if you happen to have a pan, which genuinely increases the iron content of what you cook, particularly with acidic foods.

If your digestion has been sluggish since birth, absorption may also be affected. Our article on gut health covers this, and it is worth reading alongside.

Supplements, and how to take them properly

If you are genuinely deficient, food alone will rarely rebuild stores at a useful speed, so supplementation is often needed. A few things worth knowing.

Please test before supplementing at dose. Excess iron is genuinely harmful and accumulates, so guessing is not sensible. If your GP has confirmed deficiency, follow their guidance on dose.

Gentler forms exist. Ferrous sulphate is commonly prescribed and commonly causes constipation and nausea. Ferrous bisglycinate, sometimes sold as gentle iron, is generally better tolerated, as is iron bisglycinate in liquid form. If a prescribed supplement is making you miserable, do go back and ask about alternatives rather than simply stopping.

Alternate-day dosing may work better. This surprises people. Research suggests taking iron every other day can result in better absorption than daily dosing, because a hormone called hepcidin rises after an iron dose and blocks absorption for the following day or so. Alternate-day dosing also tends to cause fewer side effects. Worth discussing with your GP.

Take it away from tea, coffee, calcium and antacids, and with something containing vitamin C.

Expect constipation and plan for it. Iron is a common cause, and constipation postpartum is miserable, particularly with stitches or a caesarean wound. Fibre, fluids and asking your pharmacist about a stool softener early rather than waiting.

How long it takes to feel better

Honestly? Longer than you would like, and this is worth knowing so you do not give up.

Many women notice some improvement in energy within two to four weeks of starting treatment. But rebuilding your actual stores takes considerably longer, typically three to six months of consistent supplementation.

This is precisely why so many women stop too early. They feel a bit better after a month, stop taking it, and are depleted again within weeks. Please keep going for the full course your GP advises, and ask for a repeat test to confirm your stores have genuinely recovered rather than just your symptoms.

When it might be something else

If your iron is fine and you still feel dreadful, other things are worth ruling out.

Thyroid dysfunction, as above, and genuinely common in the first year after birth.

B12 deficiency, particularly if you are vegetarian or vegan, or take medication affecting absorption.

Coeliac disease, which impairs absorption and is frequently diagnosed only after unexplained iron deficiency that does not respond to supplementation. Worth considering if your levels will not come up despite treatment.

Postnatal depression, which causes profound fatigue and is common and treatable. Our article on postnatal depression and anxiety covers this properly, and exhaustion with low mood deserves a proper conversation.

Simply the sheer physiology of newborn sleep deprivation, which is a genuine cause in itself and not to be dismissed.

When to speak to your GP

Please book an appointment if you have exhaustion that goes beyond what feels reasonable, or several of the symptoms listed earlier clustering together.

Please seek prompt advice for palpitations, breathlessness at rest rather than on exertion, fainting or near-fainting, or chest pain. Severe anaemia genuinely needs treating rather than waiting out.

And if you had a postpartum haemorrhage, do ask for your iron to be checked even if nobody has offered, since this is a group where deficiency is very likely and follow-up is inconsistent.

What to hold onto

Being exhausted with a newborn is normal. Being breathless on the stairs is not.

If you suspect low iron, ask for a ferritin test specifically, ask for the number, and do not accept “normal” without knowing what the figure actually was. Pair your iron-rich foods with vitamin C, keep tea away from meals, and if you need supplements, take them properly and for long enough.

Feeling this depleted is not something you simply have to accept as part of new motherhood.

If you would like to read more, our article on postpartum hair loss covers the closely related picture, and what to eat while breastfeeding goes into the wider nutritional demands of this season. Anaemia in pregnancy covers the other side of this, and protein for women matters here too, since protein helps you absorb iron from plant foods. If you would like personalised support feeling genuinely well again, do take a look at how I work or simply get in touch.

Written by

Brydee Thomas

Holistic health coach and founder of Radiant Bloom, supporting women through trying to conceive, pregnancy and the postpartum months. Evidence-based guidance, no programmes and no generic plans.