0–12 months.
“The fastest year of brain growth a human ever has. Eighty-six billion neurons, learning what a face is, what a voice means, what comes after the cry.”
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The research swims past.
Reach in and pull out a question. The full archive is below.

Baby Fine Motor Skills Activities by Age: What the Research Says
Everything you've read about training your baby's pincer grasp is built on shakier ground than anyone admits — the most famous fine motor "shortcut" in infant research failed its pre-registered replication. What actually develops hand skill in the first year is surprisingly simple: more floor time, postural support, and variety of self-directed exploration. Here's what the research shows, by age, from birth to 12 months.

When to Drop a Nap: What the Charts Don't Tell You
Every chart gives you age ranges. What none of them explain is why those ranges exist — and why two toddlers the same age can have completely different transitions. Here's what the neuroscience says, including what happens to night sleep and whether quiet time does anything.

Baby Sleep Regression: Ages, Signs and What to Do
"Sleep regression" has been in every parenting app for twenty years. There is no medical definition for it. What research actually tracks is something more specific: the week your baby learns to crawl, pull to stand, or walk — and what that means for the nights that follow. Why earlier crawlers wake more than later ones, why the four-month change is permanent, and the only intervention with randomized trial evidence behind it.

How to Introduce Allergens to Baby Safely: What Happens After the First Taste
Every guide covers the scary first spoonful of peanut butter. Almost none covers what the research says happens next — and why that part is where most families quietly fall short. Here is what two landmark trials found about timing, dose, and the months of regular exposure that drive allergy prevention.

Cause and Effect Baby: When "I Did That" First Clicks
Watch a baby drop a spoon off the high chair tray eight times and you're watching a research project, not a mess. The question the baby is testing — "did I make that happen?" — is one of the most important cognitive questions of the first year. Here's what the brain is doing, and why it matters more than any cause-and-effect toy you can buy.

Object Permanence Baby: When It Develops and What Speeds It Up
Every parenting article says object permanence develops at 8 months. The research tells a more interesting story: signs appear as early as 4 months, and the best-evidenced accelerator isn't peekaboo or any specific toy — it's whether a baby can move their own body through space. Here's what the science says, stage by stage.
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