Developmental milestones

4 months

Tick what your child already does. Nothing is saved; leaving the page clears it.

CDC milestone check

Tick what your child already does

Social/Emotional
Language/Communication
Cognitive (learning, thinking, problem-solving)
Movement/Physical Development

0 of 13 ticked

The 2022 revision moved the bar from what 50% of children do to what about 75% or more do, so a milestone a child has not reached is worth raising sooner than the older lists implied.

Missing one does not mean something is wrong. What it is for: read those items out at the next well-child visit. This page does not diagnose, and it is not a substitute for a standardized, validated screening tool.

China’s warning signs, alongside

China’s nearest checkpoint is more than a month away from this one, so there is nothing to place alongside.

WHO motor attainment windows

  • Sitting without support: 3.8–9.2 months

Place your child’s attainment age in the window

Where the measurements sit

Development is half of it; the body is the other half. This works out your own child’s height and weight position, entered once and used site-wide.

Whose standard
Sex

Fill in the fields to see the position

Everything is computed in your browser. What you type is never sent to a server and is never stored.

Where this page’s data comes from

  • CDC Learn the Signs. Act Early. milestone checklists (revised February 2022)
  • WHO Motor Development Milestones (2006, MGRS motor development study)