Three Generations in the Womb

The Science Behind Transgenerational Trauma

Before you were born, part of you was already here.

When your grandmother was pregnant with your mother, the egg that would one day become you was forming inside your mother’s developing ovaries. Three generations shared one biological environment at the same time.

In recent years, this simple biological reality has taken on new significance. Research in epigenetics and stress physiology suggests that trauma may not only affect the person who directly experiences it. It may also influence children and grandchildren in measurable ways.

The idea that trauma can echo across generations was once considered symbolic or psychological. Today, it is increasingly accepted as a biological fact.

Three Generations, One Environment

During fetal development, a female fetus forms her lifetime supply of eggs while still in her own mother’s womb. If that fetus grows up to have a daughter, the egg that becomes the grandchild was already present during the grandmother’s pregnancy.

In other words, grandmother, mother, and grandchild may share the same environmental landscape during a single pregnancy.

If that landscape includes chronic stress, malnutrition, war, displacement, or severe emotional shock, those exposures may influence more than one generation simultaneously.

This does not mean that trauma is destiny. It simply means that the body records experience in ways we are only beginning to understand.

Cortisol, PTSD and the Stress Response

To understand how trauma might travel biologically, we need to look at the stress response system.

The hypothalamic pituitary adrenal axis, often referred to as the HPA axis, regulates the body’s response to stress. Cortisol, the primary stress hormone, helps mobilise energy and then return the body to baseline once a threat has passed.

In people exposed to severe trauma, particularly chronic trauma, this system can become dysregulated. Some individuals with post traumatic stress disorder show altered cortisol patterns that affect how their nervous system responds to perceived threat.

Research involving Holocaust survivors and their children found that descendants of individuals with PTSD often display altered cortisol levels similar to their parents. Similar findings have been observed in populations exposed to war and large scale traumatic events.

Importantly, these stress patterns cannot be explained solely by parenting style or storytelling. Biological markers suggest that stress regulation itself may be shaped across generations.

Children of parents with PTSD are statistically more vulnerable to anxiety, depression, and stress related disorders. The nervous system appears to inherit not only eye colour and height, but aspects of threat detection and regulation.

DNA Methylation and Stress Imprinting

The field of epigenetics provides a mechanism for how this may occur.

Epigenetics refers to changes in gene expression that do not alter the DNA sequence itself. Genes can be switched on or off through chemical processes that respond to environmental input. One of the most studied mechanisms is DNA methylation, a process that can reduce or silence the expression of specific genes.

When an individual experiences trauma, stress related genes may undergo epigenetic modification. These modifications influence how the body regulates inflammation, mood, and stress reactivity.

In some cases, certain epigenetic markers appear to escape the normal resetting process that occurs during reproduction. This means aspects of stress imprinting may be passed to offspring.

It is crucial to emphasise that this is not genetic damage. It is adaptation. The body is adjusting to the environment it anticipates.

If your ancestors lived in conditions of danger, heightened vigilance and rapid stress activation would have increased survival. The problem arises when inherited stress responses persist in relatively safe environments, creating a mismatch between biology and reality.

Adaptive Inheritance: Survival in a New Context

Inherited stress sensitivity can be understood as protective rather than pathological.

Hypervigilance may once have helped a family survive war. Heightened sensitivity to loss may have helped maintain connection in unstable times. Rapid mobilisation in response to threat may have been essential in unpredictable environments.

However, in a modern context, these same adaptations can manifest as chronic anxiety, insomnia, irritability, or difficulty relaxing.

What was once survival can become suffering when the nervous system remains organised around a threat that no longer exists.

Understanding this shift reframes inherited vulnerability as a legacy of resilience. It also opens the possibility that change is possible.

Can Healing Alter the Trajectory?

One of the most hopeful aspects of epigenetic research is its flexibility. Epigenetic markers are not fixed. They respond to environment.

Studies in both animals and humans suggest that enriched environments, stable attachment, reduced stress exposure, and consistent regulation practices can alter gene expression over time. Stress related epigenetic patterns can shift in response to positive relational and environmental conditions.

This introduces a profound idea: if trauma can travel forward, so can healing. Regulation practices, secure relationships, and emotional integration may not only benefit the individual but influence future generations.

This is not a burden of responsibility, but It is an invitation to agency.

Beyond Biology: The Relational Field

While the biological research is compelling, trauma transmission is not purely molecular. It is also relational.

Children inherit not only stress hormones but emotional atmospheres. Unresolved grief, silence around traumatic events, and unconscious family loyalties shape the developing nervous system.

Systemic approaches such as Family Constellations address this relational dimension. Rather than focusing solely on individual symptoms, this method explores how unresolved events in previous generations may influence present behaviour and emotional patterns.

By mapping family dynamics spatially, unconscious identifications with traumatised ancestors can become visible. When excluded family members are acknowledged and past events are given recognition, and burdens returned to where they belong, individuals often experience a dramatic reduction in emotional intensity.

From a biological perspective, this may reduce chronic stress activation. From a relational perspective, it restores order within the family system.

The two perspectives are not mutually exclusive; they are complementary.

Trauma Travels. So Does Healing.

The image of three generations sharing one womb invites humility. Our bodies are not isolated from history; they are shaped by it.

But history is not fate.

Trauma can imprint stress responses across generations. It can influence cortisol regulation and gene expression. It can echo through both biology and relationship.

Yet epigenetic research also suggests something equally powerful. Change is possible and regulation is possible.  If trauma can travel forward, so can resilience. So can awareness. And so can repair.

We inherit more than stories, we inherit biology. And in tending carefully to our own nervous systems and relationships, we may be shaping more than our own wellbeing.

We may be quietly and positively influencing the generations yet to come.

Camilla Brinkworth is a Family Constellations facilitator and trauma-informed practitioner specialising in nervous system regulation and transgenerational healing. She works one to one in Bali and online globally, integrating systemic therapy with evidence-based understanding of stress physiology and inherited trauma.