Is sleep training safe for babies? Research now shows that letting babies “cry it out” can disrupt their developing nervous system and brain — raising the risks for anxiety, depression, and even addiction later in life. In this episode of the Biology of Trauma® Podcast, Dr. Darcia Narvaez unpack the science of early childhood development, attachment trauma, and nervous system regulation.
Early parenting choices, from sleep training to leaving babies to cry alone, shape a child’s mental health for years to come. These practices can impact emotional safety, vagus nerve function, and the ability to regulate stress — creating hidden challenges that show up as anxiety, depression, and relationship struggles later in life.
You’ll hear about:
[7:42] How sleep training and crying it out disrupt a baby’s developing nervous system
[12:30] The link between early separations and anxiety, depression, and attachment issues later in life
[16:45] How your own childhood experiences influence your health, relationships, and parenting style
[30:15] Practical ways to rebuild connection and help your child’s nervous system heal
[35:22] Why the vagus nerve is essential for emotional regulation in children
Whether you’re a practitioner wanting to understand how early attachment trauma affects adult clients, or a parent looking for nervous system regulation techniques and coregulation strategies to support your child, this episode offers science-backed insights and practical tools you can use right away.
Dr. Darcia Narvaez is a Professor of Psychology Emerita at the University of Notre Dame. She is the co-founder of the public and professional educational outreach project the Evolved Nest Initiative whose nonprofit mission is to share her science research into developing appropriate baselines for lifelong human wellness and providing guidelines for fostering full human potential.
Guides, Tools & Resources:
Attachment Trauma Healing Roadmap - Learn how your nervous system affects your ability to form secure attachments. Discover simple steps to rewire your nervous system for better relationships and overall health
→ https://traumahealingaccelerated.myka...
Biology of Trauma book - how the body experiences and holds fear, pain and overwhelm, and how to heal. Pre-order now and, at the time of this recording, you’ll get over $400 in bonuses included! Those bonuses are only for the pre-order window which goes until Sept 22, 2025.
→ https://amzn.to/4lVw3PL/?el=YT
When you’ve already pre-ordered it on Amazon head over here to receive your bonuses.
→https://book.biologyoftrauma.com/preo...
The Foundational Journey - a 6 week program as the place to lay the foundation for all the phases of the healing journey explained in The Essential Sequence guide. If you are looking for emotional and nervous system regulation and changes in your physical health without a pill, this is for you. If you are a practitioner - this is where it all starts with the year certificate training program to become a Biology of Trauma professional.
→ https://traumahealingaccelerated.myka...
Related Podcast Episodes:
Episode 14: How To Not Traumatize Your Infant With Common Parenting Practices With Bette Lamont, Part 2
→ https://biologyoftrauma.com/how-to-no...
Episode 92: How Chaos of Early Childhood Trauma Affects Our Adult Nervous System with Dr. Tian Dayton
→ https://biologyoftrauma.com/episode-9...
Disclaimer:
By listening to this podcast, you agree not to use this podcast as medical advice to treat any medical condition in either yourself or others. Consult your own physician for any medical issues that you may be having. This entire disclaimer also applies to any guests or contributors to the podcast. Under no circumstances shall Trauma Healing Accelerated, any guests or contributors to The Biology of Trauma® podcast, or any employees, associates, or affiliates of Trauma Healing Accelerated be responsible for damages arising from the use of the podcast.
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