Energy in Pregnancy: Six Ways to Beat Fatigue When Your Body Is Working Overtime
Yawning constantly. Eyes heavy by 10am. The couch calling your name at 3pm. Fatigue is one of the most common and least-discussed challenges of pregnancy, and it makes complete physiological sense: your body is building an entirely new organ, expanding its blood volume by up to 50%, and running metabolic processes around the clock to support a growing baby. Of course you are tired.
But while some level of fatigue during pregnancy is normal and expected, it does not have to dominate every day. These six strategies are practical, evidence-informed, and safe to implement across all three trimesters.
Why does sleep matter so much for energy during pregnancy?
This one sounds obvious, but it is the most commonly underestimated. Sleep is when your body does the majority of its repair, hormone regulation and cellular recovery work. During pregnancy, that work is significantly amplified.
Aim for seven to nine hours of sleep per night where possible. Short naps of 20 to 30 minutes during the day can meaningfully restore energy without disrupting overnight sleep. Small adjustments that make a real difference:
- An eye mask to block light
- Switching your phone to flight mode to remove notification disruption
- Keeping the room cool
- A pregnancy pillow from around the second trimester, which can significantly improve sleep quality as your body changes
For more on why sleep matters nutritionally during pregnancy, see Surviving the First Trimester.
How does magnesium help with pregnancy fatigue?
Magnesium is one of the most commonly depleted minerals during pregnancy and one of the least talked about. It is involved in over 300 enzymatic processes in the body, including energy production, muscle function and nervous system regulation.
Common signs of magnesium deficiency include fatigue, brain fog, irritability, muscle weakness and the pregnancy leg cramps that keep so many women awake at night. Supplementation, and topical magnesium applied as a spray, cream or oil to painful areas, can help with all of these.
Not all magnesium supplements are equal. Magnesium bisglycinate and magnesium citrate are the most bioavailable and best-tolerated forms. Magnesium oxide, found in many budget supplements, is poorly absorbed and commonly causes digestive upset.
In The PrenatalThe Prenatal by moode contains magnesium bisglycinate specifically for this reason. Always read the label and follow directions for use.
How to eat to maintain energy levels during pregnancy
Stable blood sugar is the foundation of stable energy. When blood sugar drops, energy crashes, mood dips and nausea often worsens, particularly in the first trimester.
The most effective approach is smaller, more frequent meals rather than three large ones. Each meal or snack should ideally contain a combination of protein, healthy fat and complex carbohydrate to slow glucose absorption and keep energy more consistent throughout the day.
Practical food choices that support sustained energy during pregnancy include:
- Eggs
- Leafy greens
- Slow-cooked meats
- Avocado
- Nuts and seeds
- Legumes
- Whole grains
Avoid relying on sugary snacks for a quick energy hit: the spike is real but brief, and the crash that follows makes fatigue worse.
For a full breakdown of the nutrients that matter most during pregnancy, see Pregnancy Nutrition: Foods to Grow a Healthy Baby.
Does dehydration cause fatigue in pregnancy?
Yes, directly and significantly. Even mild dehydration reduces cognitive function, increases feelings of fatigue and can worsen headaches and nausea. During pregnancy, fluid requirements increase because blood volume is expanding and the amniotic fluid needs to be maintained.
Aim for at least eight to ten glasses of water daily, more in hot weather or if you are exercising. A reusable water bottle that you carry with you is the simplest habit change that makes the most difference. If plain water feels unappealing (common in the first trimester), try infusing it with cucumber, citrus or mint, or sipping on pregnancy-safe herbal teas throughout the day.
Can exercise actually boost energy during pregnancy?
It seems counterintuitive, but yes. Regular moderate exercise is one of the most consistently evidence-supported interventions for pregnancy fatigue. According to the Australian Department of Health's physical activity guidelines for pregnancy, activity during pregnancy is safe for most women and has genuine benefits including improved sleep quality, reduced fatigue, better mood and reduced risk of gestational diabetes.
- Walking is the most accessible starting point and requires no equipment or preparation.
- Prenatal yoga supports flexibility, stress reduction and focused breathing.
- Prenatal Pilates is highly modifiable and specifically useful for building the core and pelvic floor strength that reduces the physical strain of a growing body.
- Swimming removes gravitational pressure entirely, which makes it particularly useful in the third trimester.
Move in ways that feel good for your body. Always discuss your exercise plans with your healthcare provider before starting anything new during pregnancy.
How does a prenatal vitamin support energy in pregnancy?
A quality prenatal provides the nutritional foundation that diet alone, particularly a diet compromised by nausea, food aversions and fatigue, may not fully cover. Specific nutrients most directly relevant to energy during pregnancy include B vitamins, which support cellular energy metabolism, and magnesium, which reduces muscle fatigue and supports sleep quality.
In The PrenatalThe Prenatal by moode contains a full B complex, magnesium bisglycinate, calcium folinate and 300mg of choline. It is Australian made, iron-free and formulated to be easy to take consistently even when nausea makes a larger capsule difficult. Consistency matters more than perfection: a prenatal you take daily in a form you can tolerate does more than a more comprehensive formula you take irregularly. Always read the label and follow directions for use.
When should you talk to your healthcare provider about pregnancy fatigue?
Most pregnancy fatigue is physiological and responds to the strategies above. But fatigue that is severe, sudden or accompanied by other symptoms warrants a conversation with your GP or midwife. Specific things worth investigating include:
- Iron deficiency or anaemia
- Thyroid dysfunction
- Gestational diabetes
- Depression or anxiety
All of these can present as or worsen fatigue, and all are identifiable through routine blood work. If you are feeling overwhelmed by fatigue rather than just tired, reach out. You know your body, and persistent exhaustion that does not improve with rest, nutrition and hydration is worth taking seriously.
moode answers your questions about energy during pregnancy
01 / Why am I so tired in the first trimester specifically?
First trimester fatigue is driven by a rapid rise in progesterone, the metabolic demands of building a placenta from scratch, and a significant increase in blood volume and cellular activity. It is often the most fatiguing period of pregnancy, even though very little is visibly happening yet. Most women find energy improves considerably in the second trimester as the placenta takes over hormone production.
02 / Is it normal to feel exhausted in the third trimester?
Yes. Third trimester fatigue has different drivers than first trimester fatigue: the physical weight of carrying a growing baby, disrupted sleep from discomfort and frequency of urination, and the body preparing for birth all contribute. Movement, nutrition and sleep hygiene remain the most useful interventions, though the intensity of fatigue at this stage is often simply something to be managed rather than resolved.
03 / Can iron deficiency cause fatigue during pregnancy?
Yes, and it is one of the most common and most treatable causes of significant fatigue in the second and third trimesters. Iron requirements increase substantially during pregnancy. A full blood panel including ferritin is the only reliable way to assess your levels. If iron deficiency is identified, supplementation should be guided by your healthcare provider in terms of dose and form, since high-dose iron can worsen nausea and digestive discomfort.
04 / Does caffeine help with pregnancy fatigue?
Caffeine is not recommended as a strategy for managing pregnancy fatigue. The current Australian guideline is to limit caffeine intake to under 200mg per day during pregnancy, roughly one to two small coffees. Using caffeine to push through fatigue does not address its cause and can interfere with sleep quality, which worsens fatigue over time.
Jess Rosenberg is the founder of moode and a trained nutritionist and naturopath. She created The Prenatal after her own experience of pregnancy left her questioning the quality of what was available on the Australian market. Learn more about moode.
Some fatigue in pregnancy is normal and expected. But it does not have to dominate every day.
