His daycare teacher pulls you aside at pickup. “He’s doing great socially, but the other kids can’t understand him most of the time. Have you thought about getting his speech checked?” You smile, thank her, and spend the drive home running through every word he said that morning. He talks constantly. He tells you stories. But now that she’s said it, you realize you understand him because you’re his parent. You’ve been translating without noticing.

Figuring out whether your preschooler’s speech is on track, slightly behind, or worth evaluating isn’t always straightforward. Knowing the speech and language red flags helps cut through the uncertainty. Kids develop language at different rates, but there are specific markers that speech-language pathologists use to decide when watching and waiting isn’t enough.

At a glance

  • By age 3, strangers should understand about 75% of what your child says. By age 4, it should be close to 100%.
  • Speech sound errors are normal at 3 (trouble with “r,” “l,” “s,” “th”). But if your child is hard to understand overall, that’s different.
  • Language red flags include short sentences, limited vocabulary, trouble following directions, or not asking questions by age 3-4
  • Early evaluation doesn’t mean something is wrong. It means you’re getting data.
  • Speech therapy between ages 3 and 5 has the best outcomes because the brain is most responsive to language intervention during this window

What’s Normal at Each Age

Speech development has a wide range of “normal,” which is part of what makes this confusing. But the CDC and ASHA (American Speech-Language-Hearing Association) provide clear benchmarks.

At age 3, your child should: - Use 3-4 word sentences consistently - Be understood by familiar people about 75% of the time - Ask “why” and “what” questions - Use pronouns (I, me, you, he, she) - Follow 2-step directions (“Get your shoes and bring them here”) - Know about 1,000 words (though you won’t count them)

At age 4, your child should: - Use 4-5 word sentences with more complex grammar - Be understood by strangers most of the time (close to 100%) - Tell a simple story with a beginning, middle, and end - Use past tense correctly most of the time - Answer “who,” “what,” “where,” and “why” questions - Follow 3-step directions

At age 5, your child should: - Speak in full, complex sentences - Use future tense - Tell detailed stories - Be fully understood by everyone - Produce most speech sounds correctly (though “r,” “th,” and “s” blends may still be developing)

Speech and Language Red Flags by Age

Not every late talker needs therapy. But certain patterns should prompt an evaluation rather than a “wait and see” approach.

At age 3, seek an evaluation if your child: - Uses fewer than 200 words - Doesn’t combine words into sentences - Is understood by strangers less than 50% of the time - Doesn’t ask questions - Can’t follow simple 2-step directions - Has lost words or skills she previously had (this is always urgent) - Doesn’t engage in back-and-forth conversation

At age 4, seek an evaluation if your child: - Is frequently unintelligible to unfamiliar listeners - Uses only simple 2-3 word sentences - Can’t retell a simple event in order - Struggles to answer basic questions about a story - Has trouble with basic grammar (no plurals, no past tense) - Gets frustrated often because people don’t understand him - Avoids talking in group settings

At age 5, seek an evaluation if your child: - Still has many speech sound errors that make her hard to understand - Uses sentences that are noticeably simpler than peers - Can’t follow classroom instructions - Struggles to tell a coherent story - Has difficulty with rhyming or recognizing beginning sounds (pre-literacy skills)

The CDC’s 2022 developmental surveillance data found that speech and language delays are the most common developmental concern in children ages 3 to 5, affecting approximately 8% of children in this age range.

Speech Sounds vs. Language: Two Different Things

Parents often use “speech” and “language” interchangeably, but they’re separate skills that can develop independently.

Speech refers to how clearly your child produces sounds. A child who says “wabbit” instead of “rabbit” has a speech sound issue. Many sound errors are completely normal at 3 and 4. The “r” sound, for example, isn’t expected to be consistent until age 6 or 7.

Language refers to vocabulary, grammar, sentence structure, and the ability to understand and use words meaningfully. A child who speaks clearly but only in 2-word phrases at age 4 has a language concern.

Some kids have both. Some have one but not the other. Knowing which area is the concern helps you know what kind of evaluation to request.

How to Get an Evaluation

You don’t need a referral from your pediatrician to see a speech-language pathologist (SLP), though your pediatrician can certainly make one. Here are your options:

Through your school district (free). Under the Individuals with Disabilities Education Act (IDEA), every public school district must evaluate children ages 3-5 for free if there’s a concern about development. Contact your local district and ask for a “Child Find” evaluation. They have 60 days to complete it.

Through a private SLP. Faster access, often shorter wait times, and you can choose someone who specializes in your child’s age group. Check whether your insurance covers speech therapy (many plans do with a diagnosis code).

Through early intervention. If your child is under 3, early intervention is the route. After 3, the school district takes over.

What Happens During an Evaluation

A speech-language evaluation for a preschooler typically takes 60 to 90 minutes. The SLP will:

  • Have your child play with toys while observing spontaneous language
  • Ask your child to name pictures, follow directions, and answer questions
  • Assess speech sound production (which sounds are correct, which are in error)
  • Evaluate understanding of language (receptive language) and use of language (expressive language)
  • Talk to you about your child’s communication at home and at school

The outcome is either “within normal limits,” “mild/moderate/severe delay” with recommended therapy, or “monitor and reassess in 6 months.” An evaluation is information gathering. It doesn’t commit you to anything.

Why Early Matters

The brain is most responsive to language intervention between ages 2 and 5. Research published in the Journal of Speech, Language, and Hearing Research (2020) found that children who began speech therapy before age 4 were significantly more likely to have age-appropriate language skills by kindergarten entry compared to children who started after age 5.

This isn’t about panic. It’s about timing. If therapy is needed, starting at 3 or 4 gives your child the best chance of catching up before school demands escalate.

How Kiri Can Help

If you’re tracking your child’s development milestones and something feels off but you can’t quite pinpoint it, Kiri’s developmental specialist can help you organize your concerns before an appointment. Sometimes the difference between “he seems behind” and “he uses 2-word sentences at age 4 and strangers understand about 40% of his speech” is what gets a referral moving faster. Kiri’s AI specialist team can also help you understand what’s age-appropriate variation versus what warrants a professional look.

Frequently Asked Questions

My 3-year-old talks a lot but nobody can understand him. Is that a speech delay?

It could be a speech sound disorder rather than a language delay. If he uses long sentences, asks questions, and tells stories but the sounds come out unclear, that’s worth an evaluation. By age 3, strangers should understand about 75% of what he says.

Is it true that boys talk later than girls?

Boys do develop language slightly later on average (about 1-2 months behind girls in early milestones), according to CDC data. But this small statistical difference doesn’t mean you should dismiss concerns. A boy who’s significantly behind the benchmarks above should still be evaluated.

Will my child outgrow this without therapy?

Some late talkers do catch up on their own, especially if the delay is mild and limited to speech sounds that are age-appropriate to still be developing. But research consistently shows that waiting past age 4-5 to address significant delays leads to worse outcomes. An evaluation gives you the data to decide.

Can screen time cause speech delays?

The AAP notes that excessive screen time (especially passive viewing) is associated with language delays in young children, though the relationship is complex. Screens can’t replace the back-and-forth conversation that builds language skills. But if your child has a true speech or language disorder, reducing screen time alone won’t resolve it. Evaluation is still warranted.

Getting your child’s speech evaluated isn’t admitting something is wrong. It’s getting information. Maybe she’s fine and you leave with reassurance. Maybe she’d benefit from a few months of therapy that puts her right on track before kindergarten. Either way, you’ll know.