Milestoneunknown· 15mo–18mo

Uses 1 definite word

Uses 1 definite word

Unknown

What the research says

Framework evidence being indexed.

Full quotes, source languages, and document links coming soon as we finish the source-evidence indexing pass.

Normative evidence

1 source back this milestone. The bars below show the age range each source covers.

This milestone15mo–18moWHO GSED0mo–3y012243648607284months
Milestone windowNormative study
The coral bar shows this milestone's typical age window. The bars below show the age coverage of each backing source.
WHO GSED →

What mastery looks like

Not yet

Cannot yet uses 1 definite word

  • No observable behavior matching this item
Emerging

Beginning to show uses 1 definite word with direct support

  • Requires significant prompting or physical assistance
Developing

Demonstrates uses 1 definite word in structured observation

  • Performs with mild support
  • Inconsistent across contexts
Secure

Consistently passes item across contexts

  • Reliably demonstrates without prompting
Reflexive

Masters item; demonstrates generalization

  • Applies skill spontaneously in novel situations

Activities for this (1)

Thinking11mo–22mo

Listen and Do

Parent gives simple verbal requests and watches whether child responds — with gestures, actions, or a word. Covers early language comprehension, first words, and command-following milestones at 12-18mo. Three phases: simple commands, question-with-gesture, and word attempts.

Formal assessments

No matching assessment items indexed yet.