Milestoneunknown· 3mo–6mo

Sits by self well

Sits by self well

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 milestone3mo–6moWHO 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 sits by self well

  • No observable behavior matching this item
Emerging

Beginning to show sits by self well with direct support

  • Requires significant prompting or physical assistance
Developing

Demonstrates sits by self well 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)

physical3mo–12mo

Rolling and Reaching

Parent observes floor mobility and early grip milestones: rolling, sitting transitions, standing with support, palmar grasp, and bilateral holding. Covers twenty-two gross motor and manipulation milestones at 3-12mo.

Formal assessments

No matching assessment items indexed yet.