When to See a Speech Therapist: Age-by-Age Red Flags

✓ Reviewed against ASHA Practice Portal, CDC “Learn the Signs. Act Early.”, ASHA developmental milestonesEvidence level ALast reviewed July 8, 2026Published July 8, 2026

See a speech-language pathologist if your child is missing key milestones for their age, is hard for others to understand, has sound or fluency problems that persist or distort, or loses words or skills at any age. You don’t need to wait for a referral or a “certain age” — evaluations are free through early intervention and schools, and earlier help is easier and more effective.

The simple rule

You should see a speech-language pathologist when your child is clearly behind milestones for their age, is hard for others to understand, has speech-sound or fluency issues that persist or distort, or loses words or skills at any age. You do not need to wait for a referral or a particular age — if you’re worried, an evaluation is the right move.^3,7

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When in doubt, check

An evaluation is reassuring either way. You never lose by checking early — you either get help sooner or peace of mind.

Age-by-age red flags

These are general guideposts, not a diagnosis. A single item isn’t alarming on its own, but any of them — and especially several together — is worth an evaluation.^2,4

When to consider a speech-language evaluation, by age.
Age	Red flags
By 12 months	No babbling, pointing, or gestures like waving
By 18 months	No words; prefers gestures over trying to talk; doesn’t follow simple requests
By 2 years	Fewer than ~50 words; no two-word phrases; hard for family to understand
By 3 years	Mostly single words; hard for strangers to understand; doesn’t follow 2-step directions
By 4–5 years	Still hard to understand; many persistent sound errors; struggles with sentences
Any age	Loss of words or skills; effortful or lingering stuttering; a wet “slushy” lisp

When to consider a speech-language evaluation, by age.

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Loss of skills = act now

A child who loses words or skills at any age should be seen promptly — start with your pediatrician.

Beyond milestones: other reasons to get seen

Milestones aren’t the only reason to see a speech-language pathologist. Any of the following is worth an evaluation, whatever your child’s age:^1,6

Speech sound errors that persist past the typical age, or sound distorted (like a slushy lateral lisp).
Stuttering that lasts more than a few months, is effortful, or comes with tension or frustration.
Trouble understanding language — not following directions or answering questions.
Frustration, avoidance, or being teased because others can’t understand your child.
Feeding or swallowing difficulties, which SLPs also assess.

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How to get an evaluation

Getting evaluated is usually easier — and cheaper — than parents expect. You typically do not need to wait for a referral to start the public process.⁷

1Under age 3: contact your state’s early-intervention program for a free evaluation.
2Age 3 and up: contact your local public school district’s special-education office for a free evaluation.
3Private option: find a certified speech-language pathologist through ASHA’s directory (insurance may require a referral).
4Not sure where to start: ask your pediatrician, who can screen and point you in the right direction.

Early support is effective and low-risk. Acting on a concern now is almost always better than waiting to “see if they grow out of it.”^5,8

Frequently asked questions

When should my child see a speech therapist?＋

See a speech-language pathologist if your child is missing milestones for their age (like no words by 18 months or no two-word phrases by age 2), is hard for others to understand, has sound errors that persist past the expected age or sound distorted, stutters in a way that lingers or is effortful, or loses words or skills at any age. When several concerns appear together, an evaluation is the clear next step.

What age should speech therapy start?＋

There’s no minimum age — speech and language support can begin in infancy and toddlerhood. Earlier is generally better, because early intervention tends to be more effective and easier than waiting. You don’t need to wait until your child is “old enough”; if you have concerns, seek an evaluation now.

Do I need a doctor’s referral for speech therapy?＋

Often not. In the U.S., early-intervention programs (under age 3) and public school districts (age 3 and up) evaluate children for free without a referral. Private therapy or insurance coverage may require a referral, so check with your provider — but you can start the public evaluation process yourself.

Should I wait to see if my child grows out of it?＋

It’s risky to simply wait. Some mild issues resolve, but it’s hard to predict which — and waiting can mean missing valuable early-intervention time. An evaluation is low-cost (often free) and reassuring either way, so checking early beats a “wait and see” approach when you have real concerns.

How do I get a speech evaluation?＋

For a child under 3, contact your state’s early-intervention program. For age 3 and up, contact your local public school district’s special-education office. You can also find a certified speech-language pathologist privately through ASHA’s directory, or start with your pediatrician, who can screen and refer.