My son is exactly 18 months old today (b
For reference only. Not medical advice.
Question
My son is exactly 18 months old today (born full-term at 39 weeks). We live in the US.
Currently, he only says one recognizable word consistently: 'mama'.
However, he understands everything we say, points with his index finger to show us things or ask for snacks, waves bye-bye, claps, and turns immediately when we call his name.
Our 18-month well-child visit with the pediatrician is next Thursday.
How does his speech compare to the CDC 18-month milestone checklist, and what should we bring or ask the doctor regarding a developmental screening?
Answer
At 18 months exactly, the CDC 75%+ list says most children try to say three or more words besides "mama" or "dada" — your son is below that line on expressive words right now.
The other language item, "follows one-step directions without any gestures" — you said he understands everything, so receptive language looks strong. The social items you described are on the same card: pointing with the index finger, waving, clapping, turning when called. Joint attention and social communication matter alongside word count, not instead of it.
What the numbers do and don't say here
The 75% line is a monitoring checkpoint, not a screening result. WHO windows exist for sitting / crawling / standing / walking only — there is no comparable band for speech to fall back on, so the reading rests on the checklist and the pediatrician's screening.
For next Thursday
| Bring, dated today | Ask the pediatrician |
|---|---|
| Words or word-attempts in the last month (including "dada" if he says it, any animal sound that means a specific thing) | equest a formal developmental screening — AAP schedules general screening at 18 months and an autism-specific one at 18 and 24 months, so both usually happen at this visit |
| Gestures: pointing (yes), waving, clapping, showing — with date | Say the word-count worry out loud so it's on the record |
| "Turns when name is called in a quiet room" — yes, today | Ask what would warrant a re-check before the 24-month visit |
| Whether he looks back to check you're close, or brings an object to show | — |
If he has not added words in the next 2–3 months after the visit, that is the window where a re-screen matters — not because one visit decides anything.
Source: https://www.cdc.gov/act-early/milestones/18-months.html (accessed 2026-09-02)
Has he started putting two words together (like "more milk" or "mama go"), or any word combinations at all?