“How many words should my 2-year-old have?” “Is it normal that my son isn't talking yet?” “My daughter's friend the same age is already saying sentences — should I be worried?”
These are the questions I hear most often from parents — and they're good questions to ask. While every child develops at their own pace, speech and language milestones exist for a reason: they give us a research-backed framework for knowing when development is on track (CDC, 2024; ASHA, 2023) and when an assessment is worth doing.
This guide covers what to expect from 12 months through 5 years — including what skills are typical, what to watch for, and when it makes sense to reach out to a speech-language pathologist.
How to Use This Guide
Milestones represent what most children can do by a certain age — not what all children can do. Some variation is normal. A child who is a few weeks behind a milestone isn't necessarily struggling.
The “red flags” listed under each age are patterns that suggest a professional assessment is warranted — not a diagnosis, but a signal that getting a second opinion is a smart next step.
If you're reading this and nodding along to several red flags for your child's age, that's useful information — not a reason to panic. Early assessment leads to early support, and early support can make a meaningful difference.
12 Months
Typical skills by this age:
- Says 1–3 words consistently (mama, dada, baba)
- Imitates sounds and simple words
- Uses gestures: waves, points, reaches
- Responds to their own name
- Understands 'no' and simple requests
Consider an assessment if:
- No babbling at all
- No gestures (waving, pointing)
- Doesn't respond to name
18 Months
Typical skills by this age:
- 10–20 words used meaningfully
- Points to show you things they want
- Follows simple 1-step instructions
- Brings objects to show adults
- Understands simple questions ('Where's Daddy?')
Consider an assessment if:
- Fewer than 6–10 words
- Not pointing to show interest
- Not following simple directions
24 Months
Typical skills by this age:
- 50+ words in their vocabulary
- Starting to combine two words ('more milk', 'big dog')
- Strangers understand about 50% of speech
- Follows 2-step instructions
- Uses words more than pointing/gesturing
Consider an assessment if:
- Fewer than 50 words
- Not combining two words yet
- Mostly using gestures instead of words
3 Years
Typical skills by this age:
- 200+ words; using 3–4 word sentences
- Strangers understand about 75% of speech
- Asks 'what', 'who', and 'where' questions
- Follows 2–3 step instructions
- Talks about what happened earlier in the day
Consider an assessment if:
- Speech mostly unclear to strangers
- Not using short sentences
- Difficulty being understood by caregivers
4 Years
Typical skills by this age:
- Most speech clear to unfamiliar listeners
- Using sentences of 4–6 words
- Tells simple stories with a beginning and end
- Understands 'why' questions
- Uses past tense (mostly correct)
Consider an assessment if:
- Still very hard to understand
- Not using sentences of 4+ words
- Substituting many sounds (e.g., 'wabbit' for 'rabbit')
5 Years
Typical skills by this age:
- Speech almost entirely clear
- Uses complex sentences with conjunctions
- Tells detailed stories; understands story sequences
- Rhymes words; interested in letters/sounds
- Follows multi-step directions in school settings
Consider an assessment if:
- Still struggling to be understood
- Significant grammar errors beyond what's typical
- Difficulty following classroom instructions
What About Speech Sounds Specifically?
Articulation — the clarity of individual speech sounds — develops on its own timeline. Young children are expected to make certain sound substitutions (saying “wabbit” for “rabbit” is completely normal for a 3-year-old). Here's a rough guide:
- By age 3: Most vowels and simple consonants (p, b, m, n, d, t, h, w) should be clear
- By age 4: k, g, f, y sounds should be emerging; speech should be mostly clear to strangers
- By age 5–6: l, sh, ch, j sounds; most blends (sp-, st-, bl-)
- By age 7–8: r, th, and complex blends typically fully developed
If your child is struggling with sounds well outside these ranges, or if their speech is very hard to understand for their age, articulation therapy can help.
The Role of Comprehension
Language is a two-way street. When we assess a child, we look at both what they can say (expressive language) and what they understand (receptive language). Comprehension typically develops ahead of expression — which is why a child who understands everything but isn't talking much can still have a language delay worth addressing.
A child who doesn't seem to understand simple instructions, who doesn't look when their name is called, or who seems to process language more slowly than expected may have a receptive language delay — even if their parents haven't noticed anything obviously “wrong.”
When to Reach Out to an SLP
Trust your instincts. If something feels off, it's always worth getting an opinion from a professional. An assessment won't hurt your child — and the earlier you act on a concern, the more options you have.
In Ontario, you don't need a referral from a doctor to access private speech therapy. You can contact a registered SLP directly, and most extended health plans cover it.
Common Questions
My child is bilingual — do the same milestones apply?
Bilingual children may reach some milestones slightly differently — for example, they might have fewer words in each language while having an equivalent total vocabulary across both. What matters is the total number of words across all languages, not per language. If you're concerned, an SLP experienced with bilingual development can assess appropriately.
My child used to say words and then stopped. Is that normal?
A sudden loss of words or language skills is always worth taking seriously and investigating promptly. While small regressions can happen around life transitions, significant loss of previously acquired language — especially after 18 months — should be assessed by a speech-language pathologist.
My child understands everything but doesn't talk much. Is that a problem?
Strong comprehension is a great sign, but expressive language (speaking) still needs to develop on schedule. A child who understands well but isn't talking should still be assessed if they're behind expressive milestones — there are many effective strategies to support expressive language even when comprehension is intact.
Are milestones the same for premature babies?
For children born prematurely, developmental milestones are typically adjusted for their corrected age (based on due date, not birth date) up to age 2. After that, children are generally evaluated against their chronological age. Your SLP will factor in prematurity when assessing your child.