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Developmental Milestones by Age — NCLEX Cheat Sheet

Red flags = no milestone by age

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👤 By the CinnaRN Clinical Content Team 🕐 Updated 2026-07-11 🏷️ Health Promotion & Maintenance 🔖 Free to read, print, and share

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Use this quick-reference guide to spot, treat, and prevent Developmental Milestones by Age on the NCLEX. Keep it handy during review and on exam day!

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Infant

Key facts

2mo: social smile
6mo: sits w/ support, rolls
12mo: walks, 1-2 words

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Toddler

Key facts

18mo: runs, ~10 words
2yr: 2-word phrases, stairs
3yr: tricycle, 3-word sentences

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Preschool

Key facts

4yr: hops, draws person
5yr: skips, ties shoes

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Red Flag

Notify / act now

No smile 3mo, no sit 9mo
No walk 18mo, no words 16mo
Loss of skill = refer now

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Quick Tip

2 months: social smile and lifts head; 4 months: rolls; 6 months: sits with support and transfers objects.

📖 Related Topics

Immunization Schedule Failure to Thrive Diabetic Diet High-Fiber Diet

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