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Vitamin & Nutrient Deficiencies Throughout Pregnancy

By Wayne Allen

March 13, 2026

Reading Time: 12 minutes

I was blessed and honored to be a supportive guide for the birth of my own children. My wife and I made the conscious and informed decision well before conceiving that we would bring our children into the world in the safest and most natural way possible…at home, just the two of us, on our own. 

Each pregnancy was different and had its own set of challenges as my wife aged and traversed through womanhood.  As I look back on those experiences, I wish there were tools readily available for us to make the journey less cumbersome and stressful. These are some of the insights that I learned along the way and how I would approach them now that resources are accessible to help families feel more empowered.

Pregnancy: A Season of Profound Nutrient Demand

Pregnancy is not just weight gain or growing a belly. It is a complete physiological transformation. Blood volume increases by up to 50%. Organs shift. Hormones surge. A placenta forms (an entirely new organ). And every cell of a growing baby is built from nutrients drawn from the mother’s body. Nutrient deficiency can create confusion and stress within a body already working overtime. 

If intake doesn’t meet the demand, the body prioritizes the baby often leaving the mother depleted. This isn’t failure, it's biology.

But depletion without awareness and preparation can contribute to:

  • Fatigue

  • Hair thinning

  • Insomnia

  • Brittle nails

  • Mood instability

  • Muscle weakness/leg cramps

  • Slow postpartum recovery

  • Heightened stress sensitivity

Common Nutrient Deficiencies During Pregnancy

Iron

Iron needs during pregnancy nearly double due to increased blood volumes. Iron supports the expanded blood volume and oxygen transport throughout the body and to the baby. Low iron levels can contribute to an expecting mother encountering fatigue, shortness of breath, dizziness and pale skin. These are common issues that experts recommend monitoring closely during pregnancy.

Folate (Vitamin B9)

Folate plays a critical role in early fetal development, particularly in neural tube formation as highlighted by trusted health resources. Most prenatal vitamins contain folic acid, however absorption and dietary intake are still essential. Natural sources of folate can be found in leafy greens, beans, citrus fruits & avocado.

Calcium & Vitamin D

When calcium intake is insufficient, the body may draw from maternal bone stores. Vitamin D assists calcium absorption and immune regulation. Low levels of vitamin D may influence muscle cramps, bone discomfort & mood shifts.

Omega-3 Fatty Acids (DHA)

Omega-3s, especially DHA, supports fetal brain and eye development. Natural dietary sources include eggs, wild salmon, sardines, chia seeds, flaxseed & walnuts.

Magnesium

Magnesium is often overlooked but essential for muscle relaxation, sleep support & nervous system regulation with recommended intakes increasing during pregnancy. Low levels of magnesium may contribute to leg cramps and restlessness, something I personally watched my wife experience during the third trimester of our first child.

Vitamin B12

This one plays an essential role in red blood cell formation, neurological function and DNA synthesis. During pregnancy, these processes accelerate as the baby’s brain and nervous system develop rapidly.

Low B12 levels may contribute to fatigue, weakness, tingling sensations and cognitive fog. For women who follow vegetarian or plant based diets, B12 awareness becomes even more important, as it is found primarily in animal-based foods like meat, eggs and dairy.

Zinc

Zinc is often overshadowed by iron and folate, but it plays a quiet and powerful role in pregnancy.

It supports cellular growth, immune function and tissue repair, all of which are critical during fetal development and postpartum healing.  After birth, when the body is repairing tissue and recalibrating hormonally, zinc continues to matter deeply.

My wife imparted to me the importance of this mineral during her healing process. She tore during the final push when our daughter arrived earthside. I’ll spare you the details, but birthing unattended at home came with responsibilities that tested me in ways I hadn’t anticipated. Needless to say, she sewed up the tear on her own while I held the mirror and looked the other way. 

Prenatal Vitamins

Prenatal vitamins are often the first line of defense. They provide a baseline of essential nutrients to support pregnancy. But they are not personalized. Absorption varies and pre-existing deficiencies may still exist. A standard formula may not account for how one woman’s body uniquely metabolizes minerals compared to another. That’s where personalized insight can help, tools like at-home hair analysis can reveal specific mineral imbalances before or during pregnancy.

Some women enter pregnancy already depleted from stress, previous pregnancies, restrictive diets or simply the demands of modern life.  A prenatal vitamin can support the foundation, but it may not rebuild what has already been drawn down.

That’s where awareness becomes powerful. When nutritional status is better understood, supplementation and diet can be approached more thoughtfully rather than generically.

Dietary Support Throughout the Trimesters

Nutrients rarely operate in isolation. Iron interacts with vitamin C. Vitamin D influences calcium absorption. Magnesium supports nervous system balance. Supporting pregnancy is not about chasing single supplements, it’s about understanding the broader nutritional picture.

From what I observed in our own home, consistency mattered more than perfection. Here is what I learned:

During the first trimester, when nausea or food aversions made eating feel like a challenge, small and steady nourishment often made the biggest difference. Simple proteins, mineral rich broths, easy to digest whole foods and staying hydrated helped to stabilize energy when her appetite fluctuated.

As pregnancy progressed into the second trimester, my wife’s appetite returned as her nutritional demand continued to rise. This period became about building. We focused on incorporating quality protein at each meal, leafy greens, healthy fats, iron-rich foods paired with vitamin C and mineral-dense options like seeds, legumes and whole foods that felt sustainable and achievable, guidelines that align with expert recommendations for balanced pregnancy nutrition.

By the third trimester, her body was carrying a significant physical load. Swelling, sleep disruption and muscle fatigue increased. At this stage, magnesium rich foods, adequate hydration and balanced meals helped support muscle relaxation and steadier energy.

Across all trimesters, a few principles seemed consistent:

  • Prioritize protein at every meal

  • Include healthy fats to support hormone balance

  • Pair iron-rich foods with vitamin C for better absorption

  • Stay mindful of hydration and electrolytes

  • Focus on whole foods before reaching for additional supplements

No approach was perfect and there were days of exhaustion and convenience. But over time, steady nourishment  appeared to soften some of the sharper edges of depletion.

Pregnancy asks a great deal from the body. We found that dietary support does not need to be complicated but it did need to be intentional.

Postpartum (Hidden Depletion Phase)

Birth is not the finish line. It’s the beginning of recovery. 

I watched my wife endure 50 hours of labor with our first child, five of those hours pushing. No epidural. Just candlelight and grit. I saw strength I didn’t know existed.

But what I think back on now isn’t the labor. It’s the days and weeks that followed. The exhaustion. The hormonal shifts. The rebuilding.

As a midwife, she would later take calls from mothers at all hours of the night, women describing fatigue, mood swings, hair shedding, brain fog. Many had been told that it was “normal” and often it’s part of the process. But normal does not mean optimal.

The body has just created life. Blood volume shifts back. Hormones recalibrate. Sleep becomes fragmented. If breastfeeding, nutrient demands remain high. Continuing to prioritize key nutrients supports both recovery and milk production.

Iron, B vitamins, zinc, magnesium and omega-3s continue to play critical roles in recovery, mood stability and tissue repair. Identifying imbalances early can guide targeted replenishment.

Postpartum depletion is rarely dramatic. It’s subtle and cumulative. A slow drain that can be mistaken for weakness when it is simply the body asking to be replenished.

From what I witnessed in my own home, nourishment mattered, as did mineral support and rest. When those pieces were in place, recovery felt steadier.

Awareness during postpartum may not prevent every challenge, but it can reduce guesswork and give women permission to rebuild instead of trying to push through.

What Awareness Can Change

Many women are told fatigue is “normal.” Hair loss is “normal.” Brain fog is “normal.”

While common, they may also signal nutrient depletion. Testing during preconception, each trimester & early postpartum can offer insight into how the body is adapting. Hair testing through 5Strands may provide a broader picture of mineral imbalances and sensitivities, allowing women to partner with their healthcare providers in making informed nutritional adjustments. For more on spotting common deficiency signs throughout life stages check out some of their other articles on the website.

Pregnancy is not a weakness. It’s an act of biological strength. But strength requires support.

And strength without support eventually strains.

Simple Awareness Checklist

  • Begin a food & symptom journal

  • Discuss nutrient testing with your provider

  • Prioritize protein and mineral-rich meals

  • Reassess nutrient levels postpartum

  • Give your body time to rebuild

Nourishing meals, mineral support & rest made a difference in how my wife recovered and how steady she felt through each stage of the process. 

Looking back, having access to a tool that provided insight into nutrient and mineral imbalances may have made certain challenges easier to identify. In our case, knowing exact mineral levels earlier would have removed some of the guesswork, modern at-home hair analysis like 5Strands now makes that possible without invasive blood draws or lengthy doctor’s visits.

This article isn’t about fear, it’s about preparation. When a woman understands where she may be depleted, she has an opportunity to nourish before burnout.

I’ve seen women push through exhaustion believing it was simply part of the process. Sometimes it is. But sometimes the body is quietly asking for support. Awareness allows that support to come sooner.

The body does not fail during pregnancy or postpartum, it adapts. Sometimes beautifully. Sometimes imperfectly. But it always deserves support.

If you are preparing for pregnancy, currently expecting or navigating postpartum recovery, consider partnering with your healthcare provider to understand your body’s nutritional needs. Tools like hair testing from 5Strands may offer insight into mineral imbalances so you can nourish with clarity rather than guesswork.

Author's Note: I have never carried a child. But I have stood beside a woman who has, three times, and I have witnessed the transformation that pregnancy demands.

For 17 years, I’ve been married to a homebirth midwife. I’ve seen quiet resilience during labor and the silent depletion that sometimes follows. I have also spent the last 16 years working as a placenta encapsulation specialist, supporting families in a small but meaningful way, during postpartum recovery. I’ve been given a unique vantage point into recovery and the many ways women attempt to replenish after childbirth.

This article is not medical guidance. It is written from deep respect and observation. I write it as a husband who cooked the meals, monitored the iron levels, rubbed the back and swollen feet and learned that growing a human being requires far more from the body than most of us understand. My wife guided my hands, poked fun at, yet encouraged my credibility as a man and supported my ideas as I typed up this piece. 

If this article does anything, I hope it will simply bring awareness to how vital nutrients and minerals are during a season when a woman’s body gives so much.

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