👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Health Promotion & Maintenance🔖 Free to read, print, and share
Also known as: baby milestones · growth and development · when babies sit walk talk · Erikson stages
Sit-stand-walk ≈ 6-9-12 months. Loss of a learned skill always warrants referral.
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Use this quick-reference guide to spot, treat, and prevent Developmental Milestones on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Types
2mo: social smile, lifts head
6mo: sits w/ support, rolls
9mo: pincer grasp, stranger anxiety
🩺 Signs
12mo: walks, 1st words, ↑3x birth wt
2yr: runs, 2-word phrases
3yr: tricycle, 3-word sentences
🎓 Teach
Cephalocaudal, proximal→distal
Erikson: trust, autonomy, initiative
🚩 Report
No smile by 3mo, no walk by 18mo
Regression / loss of milestones
📚 Developmental Milestones — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Developmental milestones are the expected motor, language, cognitive, and social skills children achieve at predictable ages, used to screen for normal growth and detect delays early. Nurses use them for anticipatory guidance, safety teaching, and to identify children who need further evaluation. Erikson's psychosocial stages frame each age: trust vs mistrust (infant), autonomy vs shame (toddler), initiative vs guilt (preschool), and industry vs inferiority (school age).
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Key points
Understand these first
By 2 months an infant smiles socially and lifts the head; by 4 months rolls and reaches; by 6 months sits with support and transfers objects.
Around 6-7 months stranger anxiety begins; by 9-10 months the infant develops object permanence and crawls.
At about 12 months children usually walk, say a few words, and triple their birth weight.
Toddlers (1-3 years) show autonomy, parallel play, negativism, and ritualism, and most achieve toilet training readiness around age 2-3.
Preschoolers (3-5 years) engage in associative play, magical thinking, and ask many questions; by 4 they hop and use scissors.
School-age children (6-12 years) value rules, cooperative play, and accomplishment, developing a sense of industry and competence.
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Nursing priorities
What to do, in order
Assess and document the child's development at each well-child visit using a standardized screening tool.
Provide age-appropriate anticipatory guidance and safety teaching to parents at each stage.
Match teaching, play, and procedures to the child's developmental and cognitive level.
Encourage age-appropriate play and stimulation to promote growth and bonding.
Refer children who show developmental delays for further evaluation and early intervention.
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Red flags — report now
Escalate immediately
Loss of previously acquired skills (developmental regression) requires prompt evaluation.
No social smile by 3 months, not sitting by 9 months, or not walking by 18 months warrants referral.
No words by 16 months or no two-word phrases by 2 years suggests a language delay needing follow-up.
Persistent failure to make eye contact or absence of imitative play may signal a neurodevelopmental concern.
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Patient teaching
What patients must know
Read, talk, and play with your child daily to support language and brain development.
Provide safe, age-appropriate toys and supervised exploration to encourage motor and cognitive skills.
Keep all well-child checkups so growth and development can be tracked over time.
Tell the provider if your child loses a skill they once had or seems behind peers.
❓ Developmental Milestones: NCLEX FAQs
What are the priority nursing interventions for Developmental Milestones?
Assess and document the child's development at each well-child visit using a standardized screening tool. Provide age-appropriate anticipatory guidance and safety teaching to parents at each stage. Match teaching, play, and procedures to the child's developmental and cognitive level. Encourage age-appropriate play and stimulation to promote growth and bonding.
What are the warning signs of Developmental Milestones a nurse must report?
Loss of previously acquired skills (developmental regression) requires prompt evaluation. No social smile by 3 months, not sitting by 9 months, or not walking by 18 months warrants referral. No words by 16 months or no two-word phrases by 2 years suggests a language delay needing follow-up. Persistent failure to make eye contact or absence of imitative play may signal a neurodevelopmental concern.
What do I need to know about Developmental Milestones for the NCLEX?
By 2 months an infant smiles socially and lifts the head; by 4 months rolls and reaches; by 6 months sits with support and transfers objects. Around 6-7 months stranger anxiety begins; by 9-10 months the infant develops object permanence and crawls. At about 12 months children usually walk, say a few words, and triple their birth weight. Toddlers (1-3 years) show autonomy, parallel play, negativism, and ritualism, and most achieve toilet training readiness around age 2-3.
What patient teaching is important for Developmental Milestones?
Read, talk, and play with your child daily to support language and brain development. Provide safe, age-appropriate toys and supervised exploration to encourage motor and cognitive skills. Keep all well-child checkups so growth and development can be tracked over time. Tell the provider if your child loses a skill they once had or seems behind peers.
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Quick Tip
By 2 months an infant smiles socially and lifts the head; by 4 months rolls and reaches; by 6 months sits with support and transfers objects.