Komboni Dokota

🧠 Does pregnancy really make the brain shrink ?

While scrolling through my news feed, I came across a post saying that “the brain shrinks during pregnancy.”

At first, that statement can sound frightening. Does it mean pregnant women lose brain cells? Does it mean pregnancy makes a woman less intelligent? Is the brain being damaged?

Not exactly.

There is scientific evidence that pregnancy produces significant changes in the brain. However, the phrase “brain shrinkage” is an oversimplification of what researchers are actually observing.

🧠 Pregnancy changes the brain—not just the body

When we think about pregnancy, we usually think about the growing uterus, hormonal changes, weight gain, increased blood volume and changes in almost every organ system.

But the brain also responds to pregnancy.

Pregnancy involves dramatic changes in hormones, particularly hormones such as **oestrogen and progesterone, and these hormonal changes influence the nervous system. The brain is highly plastic, meaning it can reorganise its structure and function in response to major biological experiences.

Researchers therefore describe pregnancy as a period of neuroplasticity—a time when the maternal brain undergoes substantial remodeling.

What does “grey matter decreases” actually mean?

One of the findings that received considerable attention came from MRI research showing reductions in grey-matter volume in particular areas of the brains of women who had been pregnant.

Grey matter contains neuronal cell bodies, synapses and supporting cells and is involved in many functions, including information processing, memory, emotion and social cognition.

A 2017 study found reductions in grey matter in areas involved particularly in social cognition—the processes we use to understand other people's emotions, intentions and behaviour. Interestingly, some of these changes overlapped with regions that responded to the mothers' babies after birth.

This has led researchers to investigate whether some of these changes may represent adaptation and specialisation, rather than damage.

Think about it this way:

The brain does not necessarily become “worse” when its structure changes.

The brain constantly remodels itself.

Learning a new skill, adapting to a new environment, experiencing major hormonal changes and developing new behavioural patterns can all be associated with changes in the brain.

But does the whole brain actually become smaller?

This is where social-media headlines can be misleading.

A 2024 precision-imaging study followed one woman from before conception through pregnancy and for two years after birth. Researchers observed widespread reductions in cortical grey-matter volume and cortical thickness during pregnancy.

But they also observed increases in white-matter microstructural integrity and changes in other brain measures.

In other words, the brain was not simply “shrinking.” Multiple components of the brain were changing in different directions at the same time.

That is why scientists often describe pregnancy as a period of extensive neural remodeling rather than simply brain loss.

🤔 What about “pregnancy brain”?

Many pregnant women describe becoming more forgetful, distracted or mentally slower during pregnancy. You may hear this called “pregnancy brain” or “baby brain.”

There is some scientific evidence supporting modest changes in certain cognitive functions, particularly memory and attention, although the research is not completely consistent.

A 2025 systematic review of 31 studies involving 1,596 pregnant women and 1,450 non-pregnant controls found evidence of modest effects on verbal memory and attention, while also noting substantial variation between studies and the need for further research.

Importantly, these findings do not mean that pregnant women become unintelligent.

A woman can experience occasional forgetfulness while remaining perfectly capable of reasoning, learning, making decisions and performing complex tasks.

😴 And there is another factor: sleep

Pregnancy itself can make sleep difficult.

As pregnancy progresses, women may experience discomfort, frequent urination, heartburn, back pain, anxiety, hormonal changes and later the physical demands of carrying a baby.

Poor sleep alone can affect:

* concentration
* memory
* attention
* mood
* reaction time
* mental energy

So when someone says, “I can't remember anything since I became pregnant,”it would be an oversimplification to blame everything on structural changes in the brain.

Hormones, sleep, stress, fatigue, emotional changes and the physical demands of pregnancy can all contribute.

❤️ Is this brain damage?

Current evidence does not support interpreting these pregnancy-related structural changes as ordinary brain damage.

In fact, researchers are interested in whether some of these changes represent an adaptive process associated with the transition to motherhood.

The 2017 study found that pregnancy-related grey-matter changes were associated with measures of maternal attachment after birth, which researchers interpreted as potentially consistent with adaptation to motherhood.

However, we should be careful here.

Scientists are still working out exactly what every structural change means. Finding that two things are associated does not prove that one directly causes the other.

So it is better to say:

“These changes may help the brain adapt to motherhood.”

rather than:

“Pregnancy shrinks the brain so that a woman becomes better at parenting.”

The second statement goes beyond what the evidence can establish.

🔄 Do the changes disappear after delivery?

Some pregnancy-related brain changes partially reverse after childbirth, while others may persist for considerably longer.

For example, the 2024 precision-imaging study found that some measures partially rebounded postpartum.

On the other hand, the 2017 study reported that some grey-matter reductions remained detectable at least two years after pregnancy.

These findings are not necessarily contradictory.

The brain does not have to return exactly to its pre-pregnancy state for the changes to be normal or adaptive. Some changes may reverse, while others may represent longer-lasting adaptations to motherhood.

🧠 An important lesson about the brain

We sometimes think of brain volume as if “more = better” and “less = worse.

But neuroscience is more complicated than that.

Brain function depends on how different cells, connections and networks are organised and communicate not simply on how much grey matter there is.

One possible mechanism researchers have discussed is synaptic pruning, where some neural connections are reduced while other networks become more specialised or efficient.

This is not the same thing as the brain being destroyed.

It is more like remodeling a system to adapt to new demands.

Imagine renovating a house.

During renovation, some walls may be removed while others are strengthened or redesigned. The fact that one part becomes smaller does not automatically mean the house has become worse. The overall organisation and function matter.

The brain is obviously much more complicated than a house, but the analogy helps explain why a reduction in one structural measure does not automatically equal loss of function.

👩‍🍼 Why would pregnancy require brain adaptation?

Motherhood introduces an entirely new set of demands.

A mother has to respond to an infant's cries, recognise facial expressions, interpret behaviour, regulate emotions, remain vigilant, develop attachment and continuously learn the needs of another human being.

The brain is therefore operating in a completely different biological and social environment.

Researchers are investigating whether pregnancy-related neuroplasticity helps prepare the brain for some of these demands.

But again, this remains an active area of research. We should not present every proposed explanation as established fact.

🚨 One more important distinction

Normal pregnancy-related forgetfulness is very different from severe confusion or neurological symptoms.

A pregnant woman who develops sudden severe confusion, loss of consciousness, seizures, weakness on one side of the body, difficulty speaking, severe persistent headache, vision changes or other alarming neurological symptoms should not simply assume that it is “pregnancy brain.”

Those symptoms require medical assessment because pregnancy can also be associated with serious medical conditions.

So, what should we remember?

When you see a headline saying:

“Pregnancy shrinks the brain!”

don't immediately conclude:

❌ Pregnancy damages the brain.
❌ Pregnant women lose intelligence.
❌ Women lose brain cells simply because they become pregnant.
❌ “Pregnancy brain” means permanent cognitive decline.

A more accurate interpretation is:

✅ Pregnancy produces major hormonal and physiological changes.

✅ The maternal brain undergoes structural and functional remodeling.

✅ MRI studies have demonstrated changes in grey matter, cortical thickness and white-matter characteristics.

✅ Some cognitive functions, particularly memory and attention, may be modestly affected in some women, although the evidence is mixed.

✅ Some brain changes partially reverse after delivery, while others may persist longer.

✅ These changes are being investigated as possible aspects of adaptation to pregnancy and motherhood, rather than simply evidence of brain damage.

🌸 The bigger picture

Pregnancy is one of the most profound physiological experiences the human body can undergo.

The heart changes.
The kidneys change.
The blood changes.
The immune system changes.
The hormones change.
The body changes.

And the brain changes too.

So perhaps instead of saying:

“Pregnancy shrinks a woman's brain.”

a more scientifically responsible statement would be:

“Pregnancy causes extensive remodeling of the maternal brain, including changes in grey matter and other brain structures, as the brain adapts to the physiological and social demands of pregnancy and motherhood.”

That may not be as catchy as a social-media headline but it is much closer to what the science actually tells us.

Pregnancy doesn't simply change the body. It changes the brain too. 🧠🤰🏽❤️

This is an educational explanation and does not replace medical assessment or individual medical advice.

It has been 4 months and 8 days since I started my journey as a medical practitioner.

But to be honest, there have been nights when I have asked myself, “Is this really worth it?” Especially as a volunteer medical doctor spending long hours in the hospital, enduring sleepless nights, and sometimes wondering how long I can continue volunteering while still trying to find ways to meet my daily needs.

At night, when everything becomes quiet, I sometimes think about the years I spent in medical school, the sacrifices I made, and the amount of money and resources that my family and others invested in my education. I ask myself when the sacrifices will finally begin to make sense.

Yet, somehow, when dawn comes, I wake up and walk back into the very place I questioned the night before.

And something changes.

The moment I step into the hospital, my personal worries begin to fade. My attention shifts from “What about me?” to “What can I do for this patient?”

Somewhere in the middle of the day, I find strength I did not know I had. Because when you sit with a sick patient, listen to their story, treat them, reassure them, and eventually watch them walk home feeling better, you realise that your sacrifice is not meaningless.

You begin to understand that behind every patient is a family, a story, and people who are praying and hoping for another day with their loved one.

One of the most fulfilling experiences in medicine is seeing a patient who came in very sick eventually walk out of the hospital with a smile, grateful to be going home and hopeful of seeing another day.

Maybe I don't have all the answers about what tomorrow holds. Maybe the journey is harder than I imagined. But every patient I help reminds me why I started.

For now, I will keep showing up, keep learning, keep serving, and keep trusting God with the journey.

Four months and eight days in and I am still here. Still learning. Still serving. Still becoming the doctor I prayed to be. 🩺❤️

Yours Komboni Doctor

It is well with my soul, provided my service brings hope to the hopless.

The Almight has given us the responisibilty.

For God and Zambia

Most people often ask about the duties of a doctor.
My answer is simple: it comes down to the Big Three C’s.

1. Competence – A doctor must continuously update their knowledge and skills, stay current with medical advancements, and understand the limits of their professional ability. Knowing when to seek help or refer a patient is part of true competence.

2. Communication – Every patient should be treated with respect, kindness, and dignity. A doctor must listen carefully, respect patients’ opinions, protect their privacy, and explain medical information in a clear and understandable way.

3. Correctness – The patient’s wellbeing should always come first. Doctors must respect patients’ rights to participate in decisions about their care, act with honesty and integrity, and ensure that personal beliefs never interfere with professional judgment.

In short, my duties as a doctor are guided by Competence, Communication, and Correctness — the Big 3C’s.

The first sign of Vitamin D deficiency isn't weak bones but feeling sad in winter for no reason.