Pediatric Developmental Milestones on the NCLEX
Gross motor, fine motor, language, and social milestones by age, plus the red flags that demand referral.
Milestones show up constantly because they drive teaching, screening, and abuse assessments. Know the age each skill appears and the age its absence becomes a red flag.
Infant (0-12 months)
2 months: social smile, lifts head prone. 4 months: steady head control, rolls front to back, laughs, grasps rattle. 6 months: rolls both ways, sits with support, babbles, transfers objects hand to hand. 8-9 months: sits without support, crude pincer grasp, stranger anxiety, object permanence develops. 9-10 months: pulls to stand, crawls, says mama/dada nonspecifically. 12 months: cruises or takes first steps, neat pincer grasp, 1-2 words with meaning, waves bye-bye.
Toddler (1-3 years)
15 months: walks well, stacks 2 blocks, drinks from cup. 18 months: runs, uses spoon, 10+ words, throws a ball. 2 years: walks up and down stairs, 2-word phrases, half of speech understandable, parallel play. 3 years: rides a tricycle, copies a circle, 3-word sentences, most speech understandable to strangers.
Preschool and school age
4 years: hops on one foot, copies a cross, tells stories, associative play. 5 years: skips, copies a triangle, ties shoes around 5-6, counts to 10, cooperative play with rules. School age: games with rules, team play, industry vs inferiority (Erikson).
Red flags
No social smile by 3 months. Not sitting by 9 months. No babbling by 9-12 months. Not walking by 18 months. No single words by 16-18 months, no 2-word phrases by 2 years. Persistent hand preference before 18 months (evaluate the other side). Loss of any previously achieved milestone is always a red flag and needs referral regardless of age.
Frequently asked
Parent worried their 13-month-old is not walking?
Normal. Walking is expected by 12-15 months, and 18 months is the referral line. Reassure and reassess.
When does separation anxiety start?
Around 6-8 months, peaking in the toddler years. It is a normal sign of attachment, not a problem.
Milestones for a premature infant?
Use corrected age (chronological age minus weeks premature) until about 2 years.
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