2.2 Core Workflows and Decision Points
Key Takeaways
- Developmental milestones cluster into gross motor, fine motor, language, and social-emotional domains.
- CDC milestones (2022 update) reflect what 75% of children can do at an age—useful surveillance thresholds.
- Key red flags: no social smile by 2 months, no babbling/gestures by 12 months, no words by 18 months, loss of skills at any age.
- Sitting independently ~6 months, pincer grasp ~9 months, first words ~12–15 months, walking alone ~12–15 months.
Milestones by Domain
Developmental progress is tracked in four domains: gross motor (large muscles), fine motor (hands/grasp), language/communication, and social-emotional/cognitive. The CDC 'Learn the Signs. Act Early.' milestones were updated in 2022 to reflect what 75% of children can do at a given age (a surveillance threshold), and added 15-month and 30-month checkpoints. Development proceeds cephalocaudal (head-to-toe) and proximodistal (center-to-periphery)—so head control precedes sitting, and sitting precedes walking.
The nurse confirms milestones at each well visit and screens formally (e.g., ASQ, M-CHAT-R for autism at 18 and 24 months). A milestone not yet met is monitored; multiple delays, loss of previously acquired skills, or a red flag prompts referral to early intervention.
Two concepts the exam reinforces here: developmental surveillance (informal, ongoing observation and history at every visit) versus developmental screening (a validated standardized tool at defined ages—9, 18, and 30 months for general development). A child who fails a screen is referred for diagnostic evaluation and to early intervention (Part C services, birth–3) without waiting for the next visit.
Also remember adjusted (corrected) age for preterm infants: subtract weeks of prematurity from chronologic age when judging milestones until about 2 years, so a 6-month-old born 2 months early is assessed against 4-month milestones.
High-Yield Milestone Table
| Age | Gross motor | Fine motor | Language | Social/cognitive |
|---|---|---|---|---|
| 2 mo | Lifts head when prone | Hands open briefly | Coos | Social smile |
| 4 mo | Rolls front-to-back; good head control | Reaches/bats | Laughs, turns to voice | Mimics expressions |
| 6 mo | Sits with support; rolls both ways | Raking grasp; transfers objects | Babbles consonants | Stranger awareness begins |
| 9 mo | Sits unsupported; crawls | Pincer grasp emerging | "Mama/dada" (nonspecific) | Object permanence; stranger/separation anxiety |
| 12 mo | Pulls to stand; cruises; may walk | Neat pincer; bangs objects | 1–3 words; gestures (waves) | Plays peek-a-boo; points |
| 15 mo | Walks alone | Stacks 2 blocks; uses cup | Several words; follows 1-step command | Shows objects to share |
| 18 mo | Walks up steps w/ help; runs stiffly | Scribbles; self-feeds w/ spoon | ~10+ words; points to body parts | Parallel play; imitates chores |
| 2 yr | Runs; kicks ball; jumps | Tower of 6 blocks | 2-word phrases; ~50 words; half understandable | Parallel play; temper tantrums |
| 3 yr | Pedals tricycle; climbs | Copies a circle | 3-word sentences; mostly understandable | Takes turns; toilet trained (most) |
| 4 yr | Hops on one foot | Copies a cross; draws person w/ 3 parts | Tells a story; asks "why" | Associative/cooperative play |
| 5 yr | Skips; balances on one foot | Copies a square; ties (some) | Sentences of 5+ words; counts to 10 | Follows rules; has a friend |
Note the 2022 shifts: rolling is benchmarked at 6 months and walking alone at 15 months (still normal earlier); crawling was removed as a discrete milestone because many typical children skip it.
Red Flags and Decision Points
Memorize the surveillance red flags—these trigger referral regardless of a 'busy schedule':
- No social smile by 2 months
- No babbling, pointing, or gestures by 12 months
- No single words by 16–18 months; no two-word phrases by 24 months
- Not walking by 18 months
- Loss of any previously acquired skill (language, motor, or social) at any age—a major autism/regression flag
- No interest in peers, lack of eye contact, or repetitive behaviors
Anticipatory Guidance Tied to Milestones
Guidance follows the emerging skill. When object permanence appears (~8–9 mo), warn parents about separation anxiety and teach consistent goodbye routines. When the infant develops a pincer grasp and mobility, emphasize choking and poisoning prevention (small objects, outlets, cabinet locks). When a toddler asserts autonomy, coach parents to offer choices and ignore tantrums rather than reinforce them. When a preschooler shows magical thinking, prepare them for procedures with simple, concrete, non-threatening language. Matching the teaching to the just-emerging skill is the recurring CPN exam pattern.
Physical Growth Norms
Milestones sit alongside somatic growth parameters the nurse plots on WHO (0–2 yr) and CDC (2–20 yr) growth charts, tracking the child's percentile trend over time rather than any single point. Classic benchmarks: birth weight doubles by ~6 months and triples by ~12 months; length increases ~50% in the first year; head circumference is measured routinely until 2–3 years and roughly equals chest circumference until about age 2. Posterior fontanel closes by ~2 months; the anterior fontanel closes by 18 months. The first primary teeth erupt around 6 months.
A child who crosses two major percentile lines downward, has a flattening growth curve (failure to thrive), or a bulging or sunken fontanel warrants evaluation. Plotting trends and recognizing these norms is a frequent Health Promotion task and overlaps with the Assessment domain.
Decision Sequence for a Surveillance Visit
A reliable mental sequence: confirm the chronologic (and adjusted, if preterm) age → review history for parental concerns → observe milestones across all four domains → plot growth → run the standardized screen if it is a screening visit → decide reassure-and-monitor versus refer. Choosing 'refer' for a true red flag, or 'reassure with anticipatory guidance' for a normal-but-emerging skill, is exactly the judgment the CPN exam rewards.
At which age does the nurse expect a healthy infant to sit without support and begin transferring objects from hand to hand?
A parent reports their 18-month-old said several words at 14 months but has now stopped talking and no longer waves or makes eye contact. What is the nurse's priority action?