Free guide · The Progressions Library
The 4-month sleep progression (the "4-month regression")
What's really happening when your baby's sleep changes at four months, why it's a leap forward, not something broken, and how to support them through it.
The first major brain upgrade
At four months your baby's sleep permanently rewires into adult-like 45-minute cycles, with night-time micro-arousals and the first surge of melatonin. It's often called the "4-month regression", but it's actually a sign of healthy development, a progression.
This free, 8-page guide explains the biology behind the shift, then gives you named, practical strategies for working with it: how morning light and layered comfort help your baby settle. No cry-it-out, ever.
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