The two-word stage is the period in language development when children begin to combine words into simple two-word utterances. It typically emerges between eighteen and twenty-four months of age.

Utterances such as “mommy go,” “more cookie,” or “big dog” express semantic relations—agent-action, action-object, attribute-object—while still omitting most grammatical function words. The child’s productive vocabulary is expanding rapidly, and the ability to combine words marks the beginning of syntax. Word order often reflects the dominant patterns of the language being learned.

The stage follows the one-word or holophrastic stage and precedes the appearance of longer, more grammatically complete sentences. It is a robust milestone across languages, although the specific content of the utterances varies with the child’s experience and the structure of the ambient language. Persistent absence of two-word combinations beyond the expected age may indicate a need for language evaluation.

When two words are deliberately joined to convey a relation, the child has entered the two-word stage.