Growth, Development and Health Supervision · 7 min read
Developmental Milestones, Surveillance and Bright Futures Screening
This chapter covers developmental surveillance and screening, milestones by age, primitive reflexes, red flags, and the Bright Futures schedule of standardized screens with the named tools the exam expects you to know.
Surveillance Versus Screening
Developmental surveillance is a flexible, continuous process at every health supervision visit: eliciting parental concerns, taking a developmental history, observing the child, identifying risk and protective factors, and documenting findings. Developmental screening is the use of a standardized, validated tool at set ages or whenever surveillance raises a concern.
General developmental screening (for example, the Ages and Stages Questionnaire, ASQ) at 9, 18 and 30 months.
Autism-specific screening with the M-CHAT-R/F at 18 and 24 months.
Clinical Pearl: Parental concern is a strong predictor of true delay. "Let's wait and see" in response to a worried parent is almost never the board answer.
Milestones from the CDC and AAP "Learn the Signs. Act Early." program are set at the age most children (about 75%) reach them, so missing one is a reason for closer attention and screening rather than a sign of the average child.
Milestones by Age
Key Milestones by Age
| Age | Social, language and cognitive | Motor |
|---|---|---|
| 2 months | Social smile; coos; looks at faces | Holds head up during tummy time |
| 4 months | Laughs; makes sounds back; brings hands to mouth | Holds head steady without support; pushes up on elbows |
| 6 months | Takes turns making sounds; knows familiar people; laughs | Rolls front to back; reaches for toys; leans on hands to sit |
| 9 months | Stranger awareness; babbles "mamama"; looks for dropped objects | Sits without support; moves objects hand to hand; raking grasp |
| 12 months | Waves bye-bye; calls parent "mama/dada" or special name; plays pat-a-cake | Pulls to stand; cruises; pincer grasp |
| 15 months | Tries 1-2 words besides mama/dada; points to ask for something; follows directions with a gesture | Takes a few steps alone; feeds self with fingers |
| 18 months | Says 3 or more words; follows 1-step directions without gestures; points to show interest | Walks alone; scribbles; drinks from an open cup |
| 24 months | Two-word phrases; points to things in a book; notices when others are upset | Kicks a ball; runs; walks up a few stairs |
| 30 months | About 50 words; two-word phrases with an action word ("doggie run") | Jumps with both feet; turns book pages one at a time |
| 3 years | Conversation of 2 or more back-and-forth exchanges; says first name | Draws a circle when shown; uses a fork |
| 4 years | Sentences of 4 or more words; tells what comes next in a story | Catches a large ball most of the time; serves self food |
| 5 years | Tells a story with 2 or more events; counts to 10; answers simple questions about a story | Hops on one foot; buttons some buttons |
Speech intelligibility to an unfamiliar listener is a useful rule: about 50% understandable at 2 years, 75% at 3 years and nearly 100% at 4 years.
Memory Aid: Intelligibility rises by about one quarter per year: 2 years = 2/4, 3 years = 3/4, 4 years = 4/4.
Primitive Reflexes and Motor Red Flags
Primitive reflexes are present at birth and fade as cortical control develops. Persistence beyond the expected age suggests a central nervous system problem such as cerebral palsy; asymmetry suggests a focal problem such as brachial plexus injury or clavicle fracture.
Primitive and Protective Reflexes
| Reflex | Usually disappears or appears |
|---|---|
| Moro (startle) | Fades by about 4-6 months |
| Rooting | Fades by about 4 months |
| Palmar grasp | Fades by about 3-4 months |
| Asymmetric tonic neck reflex | Fades by about 4-6 months |
| Plantar grasp | Fades by about 9-12 months |
| Babinski (upgoing toe) | May persist to 12-24 months |
| Parachute (protective) | Appears about 8-9 months and persists for life |
Developmental red flags that need prompt evaluation:
Loss of previously acquired skills at any age (regression) requires immediate evaluation.
No babbling by 12 months, no single words by 16 months, no spontaneous two-word phrases by 24 months.
No walking by 18 months.
Hand preference before about 12-18 months (suggests weakness of the other side, such as hemiparesis).
Persistent fisting beyond about 3 months, persistent primitive reflexes, or marked hypotonia or hypertonia.
No response to name by 12 months, lack of pointing or joint attention, little eye contact.
Common Trap: Referring a toddler with a speech delay only to speech therapy. Every child with a speech or language delay needs a formal audiology evaluation first or simultaneously, because hearing loss is a treatable cause.
Case Snapshot: An 18-month-old boy says "mama" and "uh-oh," does not point to show his parents things and does not respond consistently to his name. His M-CHAT-R/F follow-up interview remains positive. The correct decision is to refer at once for an autism diagnostic evaluation, to early intervention (Part C services under IDEA) and to audiology, without waiting for a confirmed diagnosis, because early intervention improves outcomes and eligibility does not require a diagnosis.
Bright Futures Screening Schedule and Tools
The Bright Futures/AAP periodicity schedule lists universal screens by age; selective screens follow a positive risk assessment. Know the ages and the named tools.
Selected Universal Screens and Their Ages
| Screen | Timing | Tool or method |
|---|---|---|
| Newborn metabolic/genetic, hearing, critical congenital heart disease | Birth hospital | Dried blood spot; OAE or ABR; pulse oximetry |
| Caregiver (maternal) depression | 1, 2, 4 and 6 month visits | Edinburgh Postnatal Depression Scale (EPDS) or PHQ-2/PHQ-9 |
| General developmental screening | 9, 18 and 30 months | ASQ (also PEDS and others) |
| Autism screening | 18 and 24 months | M-CHAT-R/F |
| Hemoglobin or hematocrit | 12 months (risk assessment at other ages) | Point-of-care or CBC |
| Blood lead | 12 and 24 months if Medicaid-enrolled or high risk (risk assessment at other visits) | Capillary, confirm elevated results venously |
| Vision | Instrument-based from about 12 months to 3 years when possible; acuity charts from about 4 years | Photoscreening; HOTV, LEA or Snellen |
| Hearing | Audiometry from about 4 years; adolescents once in each age band | Pure-tone audiometry, including high frequencies in adolescents |
| Blood pressure | Annually from 3 years | Auscultation to confirm elevated oscillometric readings |
| Dyslipidemia | Once at 9-11 years and once at 17-21 years | Non-fasting non-HDL cholesterol or fasting lipid panel |
| Tobacco, alcohol and drug use | Annually from 11 years | CRAFFT |
| Depression | Annually from 12 years | PHQ-9 Modified for Adolescents (PHQ-A) |
| Suicide risk | From 12 years | Ask Suicide-Screening Questions (ASQ) |
| HIV | At least once between 15 and 18 years | HIV test (opt-out approach) |
Named Behavioral and Psychosocial Screening Tools
| Tool | Purpose and age |
|---|---|
| ASQ | General development, about 1 month to 5.5 years; parent-completed domains (communication, gross motor, fine motor, problem solving, personal-social) |
| ASQ:SE | Social-emotional development in young children; used with or after the ASQ |
| M-CHAT-R/F | Autism risk at 16-30 months; follow-up interview for medium-risk scores |
| Pediatric Symptom Checklist (PSC, PSC-17) | Psychosocial problems (attention, internalizing, externalizing) in school-age children |
| EPDS | Postpartum depression in the caregiver; a score of about 10-13 or more is positive; any positive response to item 10 (self-harm) needs same-day assessment |
| SWYC | Survey of Well-being of Young Children: development, behavior and family risks in one tool |
| ACE questionnaire | Adverse childhood experiences; trauma-informed care |
| Hunger Vital Sign | Two-item food insecurity screen |
Social determinants of health screening (food insecurity, housing instability, utilities, transportation, interpersonal violence, caregiver substance use) is part of every Bright Futures visit. A positive screen calls for a warm referral to resources (WIC, SNAP, legal aid, housing support, social work), not just a handout.
Clinical Pearl: Screening the caregiver for depression at infant visits is within pediatric scope because maternal depression affects bonding, feeding, safety and child development. A positive EPDS calls for same-visit discussion, safety assessment and referral; a positive item 10 response needs immediate safety assessment.
Exam Tip: The ASQ is a screening tool, not a diagnostic one. A failed ASQ leads to referral for diagnostic developmental evaluation and to early intervention (birth to 3 years) or the public school district (3 years and older), not to a repeat ASQ in 6 months.
Key Takeaways
Surveillance happens at every visit; standardized developmental screening at 9, 18 and 30 months and autism screening at 18 and 24 months.
Loss of skills at any age, no words by 16 months and no two-word phrases by 24 months are red flags requiring prompt evaluation.
Hand preference before about 12-18 months and persistent primitive reflexes suggest neuromotor disease.
Every speech delay needs audiology; a positive autism screen goes to diagnostic evaluation, early intervention and audiology at once.
Know the named tools: ASQ, ASQ:SE, M-CHAT-R/F, PSC, EPDS, CRAFFT, PHQ-A, ASQ suicide screen and the Hunger Vital Sign.
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