The Science Behind Sleep Training: How It Supports Healthy Development in Infants and Toddlers

Why Sleep Training Matters

Sleep is vital for a baby’s brain development, physical growth, and emotional regulation. Yet, newborns don’t come with a built-in sleep schedule. Sleep training helps infants and toddlers learn to fall asleep independently, so everyone in the home can get the rest they need.

Infant Sleep Development: A Quick Science Snapshot

• Newborns (0–3 months): Sleep is irregular; no circadian rhythm.

• By 3–6 months: Melatonin production and a basic day-night cycle begin.

• Around 6 months: Many babies can sleep through the night without feeding.

At this stage, babies are biologically ready for sleep training.

What Is Self-Soothing?

Self-soothing is a baby’s ability to calm themselves when they wake at night. This skill lays the groundwork for emotional regulation and resilience. Sleep training helps build this capability, which is tied to healthy development of the nervous system and brain.

Is Sleep Training Safe?

Yes. Studies, including a 5-year follow-up published in Pediatrics, show that babies who undergo sleep training:

• Do not experience long-term harm

• Maintain secure attachments with caregivers

• Show no differences in emotional health compared to non-sleep-trained peers

Meanwhile, parents report lower stress, better sleep, and improved mood.

Top Sleep Training Methods (Evidence-Based)

• Cry It Out (Extinction): No checking in. Fast results, but emotionally difficult for some.

• Ferber Method (Graduated Extinction): Wait increasing intervals before comforting.

• Chair Method: Gradual withdrawal with physical presence for reassurance.

• No-Tears Approaches: Slower, but gentler and more aligned with responsive parenting.

👉 Choose the approach that fits your child’s temperament and your parenting style.

When to Start Sleep Training

Most pediatricians recommend beginning sleep training between 4 to 6 months of age, when:

• Night feeds become less essential

• Circadian rhythms begin to stabilize

• Babies show signs of self-soothing readiness

Benefits of Healthy Sleep for Babies

• Better mood and behavior

• Improved learning and memory

• Stronger immune system

• Emotional regulation

And for parents? Better mental health and stronger family dynamics.

Final Thoughts

Sleep training is not a one-size-fits-all solution, but when timed and implemented correctly, it's supported by science and can be life-changing. Trust your instincts, follow your baby’s cues, and don’t be afraid to ask for help.

If you are unsure where to begin and/or want extra support book your free call today to learn more!

Sweet Dreams,

Lauren Fowler