12/11/2025
🧠 Letting babies “cry it out” may seem harmless — but neuroscience says otherwise.
Find out what long-term harm it can cause.
Letting babies “cry it out”—a common sleep-training method—has deep historical roots in outdated science and a poor understanding of child development.
Once promoted by behaviorists in the early 20th century, this method assumes that ignoring a baby's cries encourages independence.
But modern neuroscience tells a different story: babies cry to communicate needs, and consistent caregiver response is vital for healthy emotional and neurological development. When babies are left to cry without comfort, stress hormones like cortisol flood their systems, potentially damaging brain connections and undermining the foundations of trust and self-regulation.
Research shows that responsive caregiving—soothing infants before distress escalates—lays the groundwork for independence, emotional resilience, and mental health. Prolonged crying can disrupt vagus nerve function, impair the stress-response system, and contribute to anxiety, digestive disorders, and emotional insecurity later in life. Rather than teaching independence, “cry it out” may breed mistrust and emotional withdrawal. As developmental psychologists increasingly affirm, comforting infants isn’t indulgence—it’s essential. A responsive caregiver doesn't just ease tears; they shape a more confident, secure, and socially capable human being.
Source: Narvaez, D., et al. (2024). "Dangers of ‘Crying It Out’." Psychology Today, May 17, 2024.