6.2 Developmental Surveillance & Red Flags

Domain II.A.2 asks you to perform developmental surveillance. Surveillance is not a 400-item Denver recitation and it is not the same thing as screening. Named screening tools (ASQ-3, PEDS, M-CHAT-R/F, and the rest of the inventory) are Chapter 8. This section is the visit skill: elicit concerns, observe the child, know a short list of typical anchors, recognize red flags, and know when concern triggers a validated screen and a referral you do not delay.

Surveillance versus screening

Surveillance is skilled, longitudinal, and done at every health-supervision visit. You ask about caregiver concerns, take a developmental and behavioral history, watch the child in the room, identify risk and protective factors, and document. Parental concern is data. So is a toddler who never glances at the caregiver while you talk.

Screening is a point-in-time, standardized, validated tool used at recommended Bright Futures ages (commonly 9, 18, and 30 months for general development; 18 and 24 months for autism screening) or whenever surveillance is concerning. Informal observation with a tongue depressor is surveillance, not an ASQ-3. A concerning screen is not a diagnosis; it converts the visit into further history, examination, hearing evaluation, early intervention, or specialty referral.

Do not wait for the next screening-due visit if today's surveillance is already abnormal. Give the tool now, and refer in parallel when the concern is clear.

Milestone principles — a short exam list, not a catalog

Typical ages are windows, not deadlines. Red-flag ages are later than typical ages. Missing a typical age by a few weeks is not automatically pathology; missing a red-flag age, or losing a skill, is. Current AAP/CDC milestone checklists are updated periodically (the 2022 CDC checklists shifted many items to the age when ≥75% of children have the skill). CPNP-PC items still use a small set of high-yield anchors. Know these; do not memorize 400 cells.

PNCB sample item fact. A healthy 24-month-old is expected to speak using about 30–50 words. That is an official sample-answer anchor. Pair it with two-word combinations (more milk, daddy go) and the 50% stranger-intelligibility rule at age 2. A 24-month-old with five words, no pointing, and no two-word phrases is not a late talker to reassure until preschool.

Other anchors worth keeping next to that table: follows a one-step command with a gesture around 12 months and without a gesture by about 15 months; points to request and to share (proto-imperative and proto-declarative) in the second year; three-word sentences and 75% intelligibility at 3; fully intelligible conversational speech at 4.

Language versus speech versus autism social-communication flags

These are not synonyms. Items will punish you if you treat them as one pile.

Speech is sound production: articulation, resonance, fluency, and voice. An isolated lisp or stuttering in a socially engaged child with a normal vocabulary is a speech problem. Check hearing, then speech-language pathology. It is not automatically autism.

Language is meaning and structure: receptive understanding and expressive vocabulary, grammar, and combining words. A child who understands little, has a tiny vocabulary, and does not combine words has a language disorder until proven otherwise. Hearing loss is on the differential every time. Global developmental delay and intellectual disability are on the differential when motor and cognitive skills are also behind.

Autism social-communication flags are about how communication is used, not the raw word count. Worry when you do not see joint attention, response to name, pointing to share interest, showing objects, eye contact used socially, pretend play, or flexible play. Restricted, repetitive behaviors, intense sensory interests, and rigidity support the concern. A child can have many words and still have autism if the words are not used socially (scripted speech, no back-and-forth). A child can have few words and not have autism if social engagement, pointing, and joint attention are intact — that child still needs language evaluation and early intervention.

Do not reassure he's a boy, they talk late when social-communication red flags are present. Do not diagnose autism from a single missed pincer grasp.

Red flags you should not watch-and-wait

• No social smile by 3 months
• No babbling by 9 months
• No independent walking by 18 months
• Regression of any previously acquired skill at any age — language loss at 18–24 months is a classic autism-spectrum alarm; motor or social regression is never a phase

Additional high-yield concerns: no response to name by 12 months, no pointing or showing by 15–18 months, no words by 15–16 months, no two-word meaningful phrases by 24 months, and any loss of social engagement. Tone abnormalities (persistent fisting, scissoring, early rolling with stiffness, hypotonia with frog-leg posture) pull you toward a neurologic exam, not only a speech referral.

When surveillance concern triggers screening and referral

A caregiver concern or an observed red flag is an indication for same-visit validated screening (Chapter 8 tools) and, when delay is evident, referral that does not wait for a diagnosis.

Part C is an entitlement for eligible infants and toddlers; parental concern plus your documented delay is enough to start the referral. You do not need a psychologist's autism diagnosis before EI will see a 20-month-old who does not point. You may refer to both EI and a developmental-behavioral or autism specialist. Therapy delayed pending let's recheck at the next well visit is the trap.

Clinic vignette. At a 9-month visit the father says she hates tummy time and still topples. She does not babble. Growth is fine. You plot measurements, complete the exam (tone, hips, red reflex), administer a standardized developmental screen today, refer to Early Intervention, and check hearing. You do not spend the slot only on vaccine counseling and a she will sit when she is ready handout.

Clinic vignette. A 24-month-old has about 40 words, combines two words, points to share, and is about 50% intelligible to you. That language pattern matches the PNCB sample expectation. You still complete surveillance and the 24-month autism screen because surveillance is not a word-count-only exercise.

Exam traps

1. Treating informal observation as a validated screen.
2. Reassuring away caregiver concern because growth is normal.
3. Waiting for the 18- or 30-month screening visit when today's surveillance is already abnormal.
4. Confusing speech-sound delay with autism, or conversely missing autism in a verbal child.
5. Delaying Early Intervention until a specialty diagnosis arrives.
6. Referring a 20-month-old to the school district's kindergarten IEP team as the primary path (Part C, not Part B, under age 3).
7. Ignoring regression because toddlers drop words when a sibling is born.

Surveillance every visit. Screen when due or when concerned. Refer under 3 to Part C, at 3 and older to Part B, without waiting for a label.