The Centers for Disease Control and Prevention (CDC) and the AAP have revised developmental milestones in the Learn the Signs. Act Early. program, which helps parents identify autism and developmental delays in their children.

Changes to the guidance include:

• Adding checklists for ages 15 and 30 months; now there is a checklist for every well-child visit from 2 months to 5 years.
• Identifying additional social and emotional milestones (e.g., Smiles on their own to get your attention, age 4 months).
• Removing vague language like “may” or “begins” when referring to certain milestones.
• Removing duplicate milestones.
• Providing new, open-ended questions to use in discussion with families (e.g., Is there anything that your child does or does not do that concerns you?).
• Revising and expanding tips and activities for developmental promotion and early relational health.

https://publications.aap.org/aapnews/news/19554/CDC-AAP-update-developmental-milestones-for