When do toddlers start putting two words together?

The short answer

Usually between 18 months and two years. In research on early grammar, first word combinations typically appear between 18 and 20 months.¹ The CDC’s checklist for two-year-olds includes “Says at least two words together, like ‘More milk.’” Its milestones are things most children, three in four or more, can do by that age.² Other lists agree. The American Speech-Language-Hearing Association (ASHA) places “puts two or more words together” at 19 to 24 months, and the NIH’s communication-disorders institute (NIDCD) lists “Puts two words together (‘More cookie’)” between one and two.^{3, 4}

Two is when most children are doing it, not when every child is. In a study of 1,766 Australian two-year-olds, about four in five parents said their child put words together; about one in twelve said “sometimes,” and about one in ten said not yet.⁵ By 30 months, the CDC list has moved on to two or more words with an action word in them, like “Doggie run.”⁶

What first two-word phrases sound like

Short, with the little words left out. In English, early combinations tend to be spare and “telegraphic,” like an old telegram: the words that carry the meaning, without the small ones in between.¹ “More milk.” “Daddy go.” “No bath.” The examples in the milestone lists sound the same: “my ball” and “no juice,” two-word questions like “Where kitty?” and “Go bye-bye?”, and possessives like “Daddy’s sock.”^{3, 4, 7}

Before two words, there can be a word and a gesture. A child who points at a bird and says “nap” has put two ideas together: the point supplies one, the word the other. In a study of ten children moving from single words to two, the ones who made these gesture-plus-word pairs first were also the first to say two-word combinations, such as “bird nap.”⁸

After two, phrases grow and can get a little bumpy. ASHA’s list for two- to three-year-olds has word combinations in frequent use, sometimes with a repeat, like “I want – I want juice.”⁹

Why the words come first

Phrases are built from words, and the two grow together. Researchers describe 50 to 100 words as the most common vocabulary size when first combinations appear.¹ In a large group of English-learning toddlers whose parents filled in a long checklist of words and sentences, children with more words tended to use more complex sentences, and the link was strong (a correlation of .84, on a scale where 1 is perfect). That is a correlation, not proof that words cause grammar.¹

ASHA’s list puts the two side by side as well: at 19 to 24 months, “at least 50 different words” sits next to two-word phrases.³ So the usual order is a growing pile of single words first, then phrases.¹ The word count has its own guide, how many words a 2-year-old says. At two, either few words or no two-word phrases is worth a conversation with the doctor; more on that below.

The link shows up beyond English. In a comparison of 1,001 English-speaking and 386 Italian-speaking children aged 18 to 30 months, the relationship between vocabulary size and sentence complexity was strikingly similar in both languages.¹⁰ The sentences themselves sounded different. The telegram style is the English pattern: when a small group of two-year-olds was matched for age and vocabulary, the Italian children’s longest sentences carried far more grammar, such as word endings, because Italian has far more of it to learn.^{1, 10}

In two languages

The milestone is the same for a bilingual child. The American Academy of Pediatrics (AAP) and ASHA put it plainly: by 24 months most children use two-word phrases, and these are the same milestones however many languages a child hears.⁷

The phrases may not arrive in both languages at once. In 113 toddlers learning English and Spanish together, sentence-building in each language tracked the vocabulary in that same language more closely than the vocabulary in the other.¹¹ In everyday terms, a child may be combining words in the language they have more words in, while still using single words in the other.

Phrases in either language show what your child can do, and so do mixed ones. A toddler who says “quiero más juice” is doing what the AAP and ASHA describe: using words from more than one language in the same sentence, which they call normal and not a sign of confusion.⁷ If you ever ask for an assessment, it should look at every language your child uses.¹² Our guide to bilingual two-year-olds has more on mixing.

From one word to two: what helps

Mostly, the bridge is your reply. When your child says one word, the two-word version of what they meant is a natural answer. ASHA’s tips for 19 to 24 months suggest adding to the words your child says: if they say “car,” you might answer, “You’re right! That is a big red car.”³ When a child needs extra support, speech-language pathologists typically give parents ideas and activities to do with their child, and ASHA lists “imitating or expanding the child’s actions or words” among the interaction styles that help young children’s language.¹²

The research behind it comes mostly from children who needed extra help. When researchers pooled eighteen studies in which parents learned ways to talk with children aged 18 months to five years who had language difficulties, the programs had a significant, positive effect on both understanding and speaking.¹³ In one small randomized trial with 25 late-talking toddlers, mothers were coached to focus their talk on a few words chosen for their child. Afterward the mothers talked more slowly and simply, and their children used more words and more multiword combinations than children still waiting for the program.¹⁴

• One word added to theirs. “Milk” gets “More milk?” and “car” gets “Red car.”
• A pause after. A few seconds of quiet leaves room for a turn: a word, a sound or a point.
• The same short phrases, every day. “All done.” “More, please.” “Bye-bye, Daddy.” Routines bring them back without any planning.
• An answer to the point. A point at the cup plus “more” is already two ideas, and it can get “More milk!” back. Pairs like this tend to come before two spoken words.⁸

No two-word phrases at two?

That is worth asking about. Researchers have a name for a late start to talking in a child with no other diagnosed disability or delay: late language emergence, what most people call being a late talker. For children learning only English, a widely used research marker is fewer than 50 words and no two-word combinations by 24 months.¹² Either half on its own is worth raising with the doctor. ASHA puts the share of two-year-olds with late language emergence mostly between ten and twenty percent, and reports that about fifty to seventy percent of them catch up with their peers by late preschool or school age.¹²

Those are group numbers. Many children catch up; some do not, and a list at home cannot tell which. Before age four, early skills such as combining words are not strong predictors on their own, so a professional looks at several things together: understanding, gestures, hearing and how fast the words are growing.¹² Children who have trouble understanding as well as speaking are at greater risk of poorer outcomes.¹²

When to ask

Now, if your two-year-old is not yet putting two words together, and whenever anything else worries you; no birthday is required. The CDC’s advice is to act early: talk with your child’s doctor, share your concerns and ask about developmental screening.^{2, 15} If your child loses words or other skills they once had, that is a reason to call promptly.² A hearing test is often part of the evaluation, because a hearing problem can affect speech and language.⁴

In the United States, families of children under three can ask their local early-intervention program for a free evaluation, without waiting for a doctor’s referral or a diagnosis. For a child three or older, a local public elementary school is the place to ask.¹⁵ Outside the U.S., your family doctor or child-health service is the place to start. Our late-talker guide walks through what happens next.

A short sentence to say back

Some days the short sentence is hard to find in the moment, or in the second language. In Their First Words, the Phrases tab has 500+ everyday phrases, from a two-word request to a short sentence, in nine themes such as I Want & I Need and No, Stop & All Done, and in eight languages; 35 are free. Each card has the picture, the written phrase and a female and a male native voice to copy. It is a prompt for you, not a teacher for your child; the phrase that counts is the one you say. For a meal-sized version, see four mealtime cards.