The Biology of Trauma® With Dr. Aimie · Dr. Aimie Apigian

The Biology Behind It: Do Babies Who Cry It Out Get Anxiety and Addiction Later in Life?

·19 min·1 clip

Dr. Aimie reveals how crying it out programs a baby's brain immune cells for lifelong hypersensitivity to danger.

This episode addresses a listener's question about the biological effects of letting babies "cry it out" during sleep training. Host Dr. Aimie Apigian, a trauma-informed physician, provides a scientific explanation based on a prior interview with Dr. Darcia Narvaez. The discussion centers on how early childhood experiences can program long-term brain and immune system function. Dr. Aimie states that leaving an infant to cry alone programs the brain's immune cells, called microglia, for a state of danger. She explains this programming leads to microglia becoming hypersensitive, potentially for life. The episode connects this early biological programming to the development of anxiety and depression in later years. Dr. Aimie references the full conversation in Episode 132 with developmental psychologist Dr. Darcia Narvaez. That main episode examines common parenting practices believed to contribute to future anxiety and addiction. The current mini-episode is a direct response to a question from Kendra, a pediatric nurse practitioner and podcast listener. Kendra inquired specifically about the brain inflammation mechanism mentioned in the earlier interview. A key insight is that a baby's distress signal, crying, goes unanswered during "cry it out," which the brain interprets as a survival threat. This process is described as wiring the nervous system for heightened alertness and sensitivity to threat. The episode suggests these early adaptations are not just behavioral but create lasting inflammatory biological pathways. Dr. Aimie posits that the microglia, once programmed in infancy, remain in a primed, reactive state throughout life. This biological priming is framed as an underlying factor for mental health challenges emerging in adulthood. The explanation merges concepts from developmental psychology, neuroscience, and immunology. The tone is educational and explanatory, delivered in a direct, lecture-style format by a solo host. The style is conversational yet dense with scientific terminology, aiming to translate complex biology for a general audience. This episode would deeply interest parents, caregivers, and healthcare professionals concerned with infant mental health and developmental trauma. Listeners seeking parenting advice aligned with attachment theory would find it compelling. Those who subscribe to or practice conventional sleep training methods may find the claims challenging and might choose to skip it.

Listen to the show on

Apple Podcasts Spotify

Play clips from this episode More from The Biology of Trauma® With Dr. Aimie