Can Stress During Pregnancy Impact Your Baby?

Pregnancy is often described as one of life’s most beautiful seasons, but it can also feel like one of the most stressful. Between navigating doctor’s appointments, adjusting to a changing body, and preparing for the arrival of your little one, it’s easy to feel stretched thin.

But many parents don’t realize that the stress you carry during pregnancy doesn’t just affect you—it can influence your baby, too. Research shows that a mother’s emotional and physical state creates an environment where her baby’s nervous system begins to take shape.

In other words, your stress response becomes your baby’s first blueprint for handling the world. And yes, this might sound overwhelming at first, but here’s the empowering part: by learning how to support your nervous system now, you can also nurture your child’s long-term development and well-being.

How Maternal Stress Shapes Your Baby’s Nervous System

Stress during pregnancy can directly shape how your baby’s nervous system develops. And this isn’t to blame anyone; it’s more so to understand how your child develops and what you can do to support them in the best way possible.

When it comes down to it, parents who go through stressful pregnancies often notice challenges later on, such as difficulties with digestion, sleep, or feeding in infancy, and behavioural and emotional struggles as their children grow. While every situation is unique, the common thread is the impact of the mother’s nervous system on the development of the nervous system and brain in the growing fetus.

Your nervous system is the command center for every process in your body. It has two main branches, including:

The Sympathetic Nervous System (SNS)—your “fight or flight” mode, which activates in response to stress by raising heart rate, blood pressure, and muscle tension.
The Parasympathetic Nervous System (PNS)—your “rest and digest” mode, which supports relaxation, digestion, immune function, and healing.

In a balanced state, these systems work together to help you adapt. But chronic stress pushes the SNS into overdrive while weakening the PNS. This imbalance creates a constant state of tension that can disrupt healthy hormonal rhythms, sleep, and even fertility.

One pathway that highlights this effect is the HPA axis (Hypothalamic-Pituitary-Adrenal). When you’re under ongoing stress, this system continually signals the release of cortisol and other stress hormones. While helpful in short bursts, chronic activation can create an environment that makes it harder for your body to sustain balance during pregnancy.

And here’s the link to your child: your baby doesn’t just receive nutrients and oxygen through the umbilical cord—it also receives messages from your nervous system. If your body is in chronic stress mode, that same stress can influence your baby’s developing nervous system, shaping how they respond to the world after birth.

Your Baby’s Nervous System Development Timeline

Knowing when your baby’s nervous system takes shape can help you see why caring for your own stress levels during pregnancy makes such a difference. From the very earliest weeks, your nervous system and your baby’s are intertwined.

First Trimester
- Week 3: The foundation of the nervous system begins to form.
- Weeks 5-8: Major organs start developing alongside the early brain and spinal cord.
- Week 6: Sympathetic nerves begin forming—laying the groundwork for how your child will one day respond to their environment.
Second Trimester
- Weeks 13-16: Bones and muscles develop, helping the nervous system coordinate early movement.
  Week 17: The cerebellum, which supports balance and coordination, starts forming.
- Week 26: Myelination (protective coating) of the vagus nerve begins, strengthening signals that regulate digestion, heart rate, and relaxation.
Third Trimester
- Weeks 29-32: The immune system becomes active, guided in part by nervous system signals.
- Weeks 33-36: Rapid brain growth and neural connections accelerate.
- Week 37: The autonomic nervous system is fully developed, allowing your baby to begin adapting to stress and rest cycles.
- Week 40: Both the vagus nerve and immune system reach maturity, preparing your baby for life outside the womb.

This timeline shows just how early and how consistently your baby’s nervous system is developing. By supporting your own nervous system health—through rest, nutrition, movement, and stress management—you’re actively shaping a more resilient foundation for your child. So, how can you do that?

How You Can Support Your Baby’s Development

The good news is that you have more influence than you may realize. While you can’t control every circumstance during pregnancy, you can create a body and environment that are resilient and adaptable. And, at the same time, keep in mind that nobody’s perfect. Stress happens, but we can work toward reducing it in various ways.

Here’s how you can support your nervous system and reduce the stress in your life (and, in turn, support your growing fetus!):

Eat nutrient-dense foods that support nervous system health.
Incorporate gentle, pregnancy-safe exercise.
Practice daily stress management techniques like meditation or breathwork.
Prioritize quality sleep.
Address any existing health concerns before or during pregnancy.
Surround yourself with a supportive healthcare team.
Build connections with encouraging family, friends, or birth professionals.
Maintain meaningful social and emotional support networks.

Chiropractic care during pregnancy can also make a huge difference in how your body adapts to stress and how your baby develops. At Highest Health Chiropractic, we use gentle, neurologically focused adjustments and advanced INSiGHT scanning technology to assess how your nervous system is functioning. For expecting mothers, we also utilize the Webster Technique—a specialised chiropractic approach that helps balance the pelvis and support optimal positioning for your baby.

With these tools, we can create a personalized plan that reduces stress, improves comfort, and provides your baby with the healthiest environment possible. Your Sioux Falls Chiropractor is here to help; book your appointment with our caring and compassionate team today!