The truth is, having a baby is exhausting. And some tiredness after having a baby is, of course, entirely normal as your sleep patterns are broken and your body is in recovery mode. But exhaustion that doesn't lift with rest is often a sign of nutrient depletion, not just motherhood. Up to 1 in 4 women have postpartum anaemia, and low iron, B12, vitamin D, or an underactive thyroid are common, treatable causes of ongoing fatigue. If you're running on empty for weeks or months, it's worth investigating—not pushing through.
Is it normal to be this tired after having a baby?
Broken sleep and a tired body are a normal part of early motherhood. Your newborn wakes through the night, your body is healing from birth, and your days are physically and emotionally demanding. In the first few weeks, feeling wiped out is expected.
What is not normal, however, is exhaustion that doesn't improve when you do get rest. This is the kind of exhaustion where you wake up already drained, can't think clearly, feel flat or on edge, and need coffee just to function. That level of fatigue is a signal, not a personality flaw or something you simply have to accept.
After working with countless women, I can tell you: “just part of being a mum” is the most common reason real, fixable problems get missed.
How long does postpartum fatigue usually last?
Normal recovery fatigue tends to ease over the first 6 to 12 weeks as sleep settles and your body heals. Fatigue that lingers beyond three months—or critically, gets worse instead of better—is worth investigating, because it's frequently driven by something measurable in your bloodwork rather than by parenting alone.
A useful rule of thumb: if the tiredness is out of proportion to your sleep, or it comes with symptoms like dizziness, hair loss, breathlessness, brain fog, or low mood, don't wait it out. Ask for testing.
Why am I so exhausted after giving birth? 5 common nutrition-related causes
Pregnancy, blood loss during birth, breastfeeding, stress, and sleep deprivation all increase your body's demand for key nutrients. When those stores run low, the result is genuine, physical exhaustion. These are the most common culprits I see:
Low iron (and low ferritin)
Iron carries oxygen around your body. When it's low, your cells are effectively short of fuel and this can create a heavy, crushing tiredness. Around 25% of women have postpartum anaemia, and iron deficiency is even more common when measured by ferritin (your iron stores). Importantly, you can have normal haemoglobin but low ferritin and still feel exhausted, which is why ferritin needs to be tested specifically.
Vitamin B12 deficiency
B12 supports energy, mood, and clear thinking. Low levels cause fatigue, weakness, brain fog, and mood changes. Deficiency can persist well beyond the newborn stage, with some women still B12-deficient two years postpartum.
Vitamin D deficiency
Vitamin D affects energy, mood, and muscle function. It's far more common than most mums realise and studies have found around 60% of women remain vitamin D deficient up to 12 weeks postpartum, even while taking a prenatal supplement.
Postpartum thyroid changes
Postpartum thyroiditis affects up to 10% of new mums and often goes undiagnosed. It can show up as low energy, anxiety, hair loss, or trouble shifting weight, and it's easily missed without a blood test.
Blood sugar crashes and under-eating
When you're busy with a baby, meals get skipped and replaced with quick carbs and caffeine. This sends your blood sugar on a rollercoaster of spikes and crashes… and every crash feels like a wave of exhaustion. Under-eating overall (very common in the newborn fog) leaves you without enough fuel to recover.
When should I see a doctor about postpartum exhaustion?
See your GP if your fatigue:
- Hasn't improved by around 3 months postpartum, or is getting worse.
- Doesn't lift even after a stretch of better sleep.
- Comes with dizziness, breathlessness, heart palpitations, or pale skin.
- Includes hair loss, feeling cold, or unexplained weight changes.
- Comes with persistent low mood, anxiety, or feeling disconnected. Postnatal depression and anxiety are common and treatable, and exhaustion can be part of the picture.
You deserve to be taken seriously. If you feel dismissed, it's okay to ask directly for the blood tests below.
What blood tests should I ask for if I'm exhausted after having a baby?
Ask your doctor to check:
- Full blood count (to check for anaemia)
- Ferritin (your iron stores — ask for this specifically, not just haemoglobin)
- Vitamin B12 and folate
- Vitamin D
- Thyroid function (TSH and free T4)
These five cover the most common, treatable drivers of postpartum fatigue. Knowing your numbers turns “I'm just tired” into a clear, fixable plan.
How do I get my energy back after having a baby?
Once you've ruled out (or treated) any deficiencies, the foundations that make the biggest difference are simple and realistic:
- Eat enough, and eat regularly. Aim for three balanced meals with snacks if you need them. Skipping meals makes fatigue worse.
- Prioritise protein at every meal. Protein steadies blood sugar and supports recovery: think eggs, yoghurt, meat, fish, legumes, or a protein smoothie you can eat one-handed.
- Pair carbs with protein, fat, or fibre. This flattens the blood-sugar rollercoaster so your energy stays steadier through the day.
- Replenish iron-rich foods (red meat, legumes, leafy greens) alongside vitamin C to help absorption.
- Support your nervous system daily with small, repeatable habits like getting outside, gentle movement, and protecting whatever sleep you can.
Consistency over perfection always wins here. Small, repeatable changes rebuild your energy far more reliably than an all-or-nothing overhaul you can't sustain with a baby on your hip.
The bottom line
A degree of tiredness after having a baby is normal. Exhaustion that doesn't lift is usually your body telling you it's depleted and depletion is treatable. You don't have to white-knuckle your way through it so get your bloods checked, rebuild your foundations, and start feeling like yourself again.
Frequently asked questions
Is it normal to feel exhausted months after giving birth?
Some tiredness can linger, but exhaustion beyond about three months, especially if it isn't improving, is often a sign of nutrient depletion such as low iron, B12, vitamin D, or a thyroid issue. These are common and treatable, so it's worth asking your doctor for a blood test rather than assuming it's just part of motherhood.
Can low iron cause extreme tiredness after pregnancy?
Yes. Iron carries oxygen around your body, so low iron leaves your cells short of fuel and causes heavy, persistent fatigue. Around 1 in 4 women have postpartum anaemia. You can also have “normal” haemoglobin but low ferritin (iron stores) and still feel exhausted, so ask for ferritin to be tested specifically.
What deficiencies cause fatigue after having a baby?
The most common are low iron/ferritin, vitamin B12 deficiency, vitamin D deficiency, and postpartum thyroid changes. Blood sugar crashes from skipped or carb-heavy meals also contribute. A simple blood panel can identify which ones apply to you.
When should I worry about postpartum fatigue?
See your GP if fatigue persists past three months, doesn't improve with rest, or comes with symptoms like dizziness, breathlessness, hair loss, feeling cold, or low mood. These can point to anaemia, thyroid issues, or postnatal depression.
Latoya Cruz is a qualified women's health nutritionist and the founder of The Virtual Nutritionist, helping busy, burnt-out mums rebuild their energy with simple, realistic nutrition. This article is general information, not medical advice—please speak with your doctor about your individual situation.
Want a done-for-you starting point? The Postpartum Bible walks you through exactly how to refuel and recover after baby.