What to know
Learn the Signs. Act Early. (LTSAE) developmental milestone resources can be used in many different early childhood settings. Learn more below.
Content Source
National Center on Birth Defects and Developmental Disabilities (NCBDDD)
About This Page
Published: September 4, 2025
Updated: March 12, 2025
This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.
Reviewed: March 13, 2025
The information on this page was last reviewed by subject matter experts to ensure accuracy.