Free, biology-led guides to the natural shifts of the first year. What's actually happening in your baby's brain, why it's a sign of healthy development, and how to support them through it.
Each guide explains the biology behind a developmental shift, then gives you named, practical strategies for working with it, not against it.
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. Learn why it’s a leap forward, and how morning light and layered comfort help them settle.
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Six months is a total system upgrade: rolling, sitting and crawling rehearsed at 2am, object permanence sparking separation anxiety, and solids reshaping metabolism. Discover how daytime floor play protects night sleep.
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Six guides mapping the biological progressions of the first eighteen months. New guides drop monthly. Join the newsletter to get them first.
The fourth trimester: biology of the womb-to-world transition. What "normal" newborn sleep, feeding, and settling really look like.
Notify meThe Brain Upgrade. The 45-minute check-in. The Melatonin Milestone.
Get the guideThe Total System Upgrade. Motor, cognitive, sensory, and nutritional shifts.
Get the guideThe Mobility & Anxiety Surge, when separation peaks and crawling, pulling-up, and standing rewrite the rules.
Notify meThe First Year Anchor. Walking, words, and the start of the great nap transition.
Notify meThe Cognitive Leap: autonomy, big feelings, language explosion. (Yes, the "regression" parents always ask about.)
Notify meThe Progressions Library is free because every parent deserves to understand what's actually happening in their baby's brain, without paying to find out. Read them, share them, take what's useful, and leave what isn't.
If a guide brings up specific questions about your baby (the kind that wake you up at 2am), that's exactly the kind of thing a 1:1 sleep consultation is for. But there's no obligation. The guides stand on their own.