Quick answer: Speech milestones by age describe what most children can do with sounds, words and sentences. By 12 months many children babble and may say 1 or 2 words; by 2 years they combine two words; by 3 years they use short phrases that family understands; by 4 years they use sentences of four or more words; and by 5 years they tell stories and say most sounds correctly. The CDC and AAP revised their milestones in 2022 so that each one reflects what at least 75% of children can do.
In this guide
Milestones are not a race. They are a map that helps parents and doctors notice when a child might need extra support. Knowing speech milestones by age helps you celebrate progress and act early when something seems off.
Speech Milestones by Age Chart
| Age | Understanding | Talking |
|---|---|---|
| 0 to 3 months | Reacts to loud sounds, recognizes your voice | Coos, smiles at you |
| 4 to 6 months | Follows sounds with the eyes | Babbles with p, b and m sounds, laughs |
| 7 to 12 months | Understands common words like “cup” | Waves, may say 1 or 2 words |
| 1 to 2 years | Points to body parts, follows simple commands | Learns new words regularly, puts two words together |
| 2 to 3 years | Understands more complex directions | Two or three word phrases, family understands |
| 3 to 4 years | Answers who, what, where and why questions | Sentences with four or more words |
| 4 to 5 years | Follows stories and conversations | Tells on-topic stories, adult-like grammar, most sounds correct |
Source: NIDCD milestones. In 2022, the CDC and AAP updated their checklists so each milestone reflects what at least 75% of children can do, and added 15 and 30 month checklists (Kennedy Krieger).
Key point: Because milestones now reflect 75% of children, missing one is a reason to talk with your doctor rather than wait.
Understanding and Gestures Come First
The building blocks of talking
Pointing by about 18 months is especially important. The CDC lists not pointing to show something interesting by 18 months as a possible sign of autism (CDC).
Speech Sounds by Age
| Age | How clear speech usually is | Typical sounds |
|---|---|---|
| 2 years | Familiar adults understand about half | p, b, m, n, w, h, d |
| 3 years | Family understands most speech | k, g, t, f, y added |
| 4 years | Strangers understand most speech | s, z, sh, ch, l developing |
| 5 years and up | Clear speech with a few errors | r and th among the last |
A 2020 review of U.S. studies by Crowe and McLeod found that children acquire most English consonants by age 5 (AJSLP). See articulation disorders in children.
How to Use Milestones Wisely
- Use the CDC checklist before each well-child visit.
- Write down words and phrases for a week.
- Note understanding and gestures, not only words.
- Ask for a hearing test when speech is behind.
- Request an evaluation if a milestone is missed or skills are lost.
Note to bring to a checkup
“At 18 months, Lea says 3 words, does not point and rarely follows simple directions. We would like a developmental screening and a referral for a speech-language evaluation.”
Real-Life Example
Case story
Ava’s mother used the 30-month checklist and noticed Ava used single words only. The pediatrician referred her to early intervention. Her evaluation showed an expressive delay with strong understanding. With weekly coaching and daily practice at home, Ava began using three-word phrases within four months.
Related: See speech delay in toddlers and does my child need a speech evaluation.
Speech Milestones by Age FAQ
When do babies say their first word?
Many say a first word around 12 months, with a wide normal range.
When should a toddler combine words?
By about 2 years, most children put two words together.
How clear should a 3-year-old be?
Family should understand most of what a 3-year-old says.
Why did milestones change in 2022?
They now reflect what at least 75% of children do, which helps identify delays earlier.
What if my child misses a milestone?
Talk with your doctor and request a screening or evaluation.
In short: Speech milestones by age are a guide, not a test. Track understanding, gestures, words and sounds, and act early when something is missing. This article is part of our Speech Delay series.
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Sources
- NIDCD. Speech and Language Developmental Milestones
- Kennedy Krieger Institute. New Pediatric Checklist Better Defines Developmental Milestones
- Crowe and McLeod (2020). Children’s English Consonant Acquisition in the United States
- CDC. Signs and Symptoms of Autism Spectrum Disorder
This article is educational and does not replace medical or professional advice.
