What are the CDC milestones?
“Learn the Signs. Act Early.” is the developmental milestone programme run by the US Centers for Disease Control and Prevention. It gives families a plain checklist of what most children do by a set of age checkpoints — from two months through five years — so a parent can notice early if development needs a closer look.
How it is structured
Items are grouped into four areas — Social-Emotional, Language-Communication, Cognitive, and Movement-Physical. Each milestone is tied to an age checkpoint chosen so that most children (about three in four) have reached it by that point, which makes it a practical “expect this by now” guide rather than a pass-or-fail test.
How Learning Curve represents it
The CDC materials are US Government public domain. What appears here are the milestone behaviours grouped by area and age, presented as one independent reference point on when a behaviour typically appears. Learning Curve synthesises this alongside other sources and does not present it as medical advice. This source was gathered from published CDC material and is being verified against the official pages.