The book

The Kinedu Report, explained for parents

Some claims in Big Bang Baby lean on Kinedu's milestone data. Here is how to read it without panic, and where it stops being useful.

Where the numbers come from

Parents answer questions at home about what they see their child doing: once in the Kinedu Initial Assessment, then again after activities as the child grows. The questions cover observable milestones in four areas: physical, cognitive, linguistic and social–emotional.

What a parent sees, and what it means

Expected age: a landmark, not a deadline

Each milestone carries an expected age: the point by which three in four children in the data were reported doing it. So one healthy child in four gets there later. The spread grows with age, from roughly five months for walking to about twenty-two for dressing and feeding oneself. More in the range of normal.

The order is shared; the timing is yours

Children build skills in a similar sequence, on very different calendars. So the useful question is not whether your child is on schedule but what she is ready for now. The "ready for now" tool shows what typically comes next at your child's age.

A check-in is a photograph

Your child's standing (how she compares with children her age) gives reasonable odds about her standing later, especially over short horizons. It says almost nothing about her pace: starting position accounts for about 1.5% of how quickly a child moves next, and early readings fade fastest. Compare her with her own history. More in an assessment is a photograph.

Areas pull apart after the first year

In the first months, gains in one area tend to arrive with gains in the others. Following the same children, that linkage roughly halves across the first year, so a child who is ahead in one area and still working on another is often just differentiating.

Windows narrow; they do not slam

Across the population, each skill goes from rare to common over a stretch of months, then keeps rising slowly. No permanent group of children is left stuck behind a missed window.

What the data cannot tell you

It records what children did, not what anyone did with them, so it cannot say what caused a pattern. The families chose an app, so they are not a random sample. And it is a surveillance tool: it can flag something worth mentioning to a doctor, never confirm that something is wrong.

When to talk to your pediatrician

Variation is expected; a skill that stays absent is worth asking about. In Chapter 3 I draw the line this way: bring it to your pediatrician if an expected skill has not shown up over several months, if your child loses something she could already do, if she does not respond to her name or look for your face, or if a worry has lingered without resolving. A pattern over time is the signal, not one missed milestone. If you are worried now, start with is my child behind?

The full guide is in the book

The complete walkthrough, with the charts and the map of skill windows, is an appendix of Big Bang Baby: "A Parent's Guide to the Kinedu Report." To sample the book first, read the Introduction free.

Disclosure: Luis Garza Sada is the founder and CEO of Kinedu. The Kinedu–Stanford collaboration described in the book was supported in part by funding from Kinedu.