01Core principlesThe concepts and mechanisms needed to understand the subject.
Surveillance aims to promote health, detect deviation early and support families, not to pass or fail a child at a milestone. Development varies, and a single missed skill may be normal; pattern, trajectory, quality of movement, regression, associated findings and caregiver concern determine action. Universal reviews create repeated opportunities, while targeted support should increase with need.
England’s updated Healthy Child Programme defines five mandated early reviews: antenatal, new birth, 6 to 8 weeks, 12 months and 2 to 2½ years. Health visitors lead the 0-to-5 public-health offer with general practice, maternity, paediatrics, early years and safeguarding partners. Programme schedules differ across UK nations, so local national guidance must be used.
Prepare by reviewing pregnancy and birth history, gestation, newborn screening, feeding, growth, immunisations, admissions, family history and previous concerns. Confirm who has parental responsibility and who attends. Use a professional interpreter. Speak with an older child privately for part of an age-appropriate consultation when helpful, while explaining confidentiality and safeguarding limits.
Growth measurement is technique-dependent. Weigh infants naked on appropriate calibrated scales and measure recumbent length under 2 with a length board. Measure head circumference with a narrow non-stretch tape at the maximum occipitofrontal circumference. Plot exact age on the correct sex-specific UK-WHO chart, correcting gestation when chart guidance requires. Repeat an implausible value before investigation.
Interpret trajectory. Centiles describe position relative to a reference population, not a diagnosis. Crossing centile spaces, discordance among weight, length and head growth, or poor growth with symptoms may matter more than an isolated low centile consistent with family pattern. Review measurement error, feeding, illness, psychosocial factors and parental size. Follow current NICE guidance for suspected faltering growth.
Developmental assessment combines observation, caregiver report and structured tools used by the programme. Ask about gross motor, fine motor and vision, hearing and language, social interaction, play and self-care. Consider corrected age for prematurity where appropriate. Judge quality and symmetry, not only age of acquisition. Loss of skills is a red flag and warrants prompt paediatric or developmental assessment.
Hearing and vision affect development and can be missed when delay is attributed to behaviour. Review newborn hearing outcome, recurrent otitis and response to sound; assess visual attention, red reflex history, alignment and caregiver observations. Abnormal red reflex, new visual loss or acute neurological signs require urgent specialist pathways. A normal newborn screen does not exclude later impairment.
Physical review is age-specific. At 6 to 8 weeks, integrate feeding, growth and development with the newborn and infant physical examination pathway where commissioned, including heart, eyes, hips and testes where applicable. Check femoral pulses, respiratory effort, colour, tone, movement and skin when clinically indicated. Use current programme standards for timing and referral rather than relying on memory.
Immunisation review compares documented doses with the current UKHSA schedule, which changed in 2025 and 2026. Identify missed doses and use vaccine-specific catch-up guidance; an interrupted course is commonly continued rather than restarted. Check contraindications precisely: minor illness is not a blanket reason to defer, while previous anaphylaxis to a vaccine component or specific immune states require expert guidance.
Feeding assessment includes intake, technique, swallowing, vomiting, stool and urine, parent goals and growth. Observe a feed when concern exists and involve infant-feeding or speech-and-language expertise appropriately. Support breastfeeding without blame and ensure formula preparation is safe. Dehydration, bilious vomiting, respiratory compromise during feeds or poor perfusion needs urgent clinical assessment.
Family context is clinical information. Ask about parental mood, sleep, bonding, support, smoking, alcohol or substance use, domestic abuse, poverty, housing and food security sensitively and privately when needed. Provide support, not surveillance alone. A parent declining a routine discussion is not evidence of neglect, but cumulative information may identify a child at risk.
Safeguarding is longitudinal. Note injuries inconsistent with development, delayed presentation, concerning interaction, sexualised behaviour, neglect indicators or repeated non-attendance for necessary care. “Was not brought” describes events more accurately than blaming the child. Discuss concerns with safeguarding leads and follow local referral processes; immediate danger requires immediate protection.
Health promotion includes safer sleep, smoke-free environment, accident prevention, oral hygiene from eruption of the first tooth, healthy eating, activity and screen-use discussion appropriate to the family. Avoid overwhelming carers with generic lists. Prioritise current risks, use accessible resources and verify the agreed next action.
Close every concern loop. Record measurements with date and method, developmental findings, immunisation status, parental concerns, advice and referrals. Name who will review results and by when. Active follow-up is especially important when regression, growth concern, suspected hearing loss or safeguarding makes a missed appointment potentially harmful.
Key points
- In England, the Healthy Child Programme is the national public-health nursing model from birth to 19, extending to 25 for care leavers and people with SEND.
- The mandated early-years offer includes antenatal, new-birth, 6-to-8-week, 12-month and 2-to-2-and-a-half-year health and development reviews.
- Surveillance is continuous and opportunistic; parental concern, regression, faltering growth or safeguarding signs require assessment without waiting for the next scheduled review.
- Plot weight, length or height, head circumference and BMI on the correct UK-WHO chart using accurate age, sex and gestational correction where applicable; trajectory matters more than one centile.
- Assess development across gross motor, fine motor and vision, language and hearing, and social or adaptive domains in context.
- Check the current UKHSA immunisation schedule and documented doses; do not restart an interrupted course unless vaccine-specific guidance says so.
- Observe caregiver-child interaction and ask about feeding, sleep, smoke exposure, oral health, parental mental health, domestic abuse, housing and support sensitively.
- Escalate loss of previously acquired skills, signs of serious illness, unexplained injury, neglect concern or a child not brought for necessary care through clinical and safeguarding pathways.
02Mechanisms and patternsImportant relationships and how to distinguish them.
Loss of acquired skills requires prompt assessment. Refer language or social regression before age 3 to the autism team; motor regression at any age needs paediatric or paediatric-neurology assessment. New seizures, weakness or altered consciousness require urgent clinical escalation.
Repeated downward crossing or disproportionate weight, length or head growth requires confirmation, feeding and clinical assessment.
Persistent handedness very early, unilateral weakness, unusual tone or poor movement quality can matter before a milestone is formally late.
Poor response to sound, absent visual engagement, abnormal red reflex or new squint can drive developmental difficulty and requires direct assessment.
Parental mental illness, domestic abuse, housing instability or substance dependence may increase need for coordinated support without determining parenting capacity alone.
Developmentally implausible injury, concerning interaction, neglect or repeated missed necessary care requires cumulative review and safeguarding action.
03Interpreting evidenceInformation, measurements and their limitations.
Consider the information, its meaning and its limitations before deciding what follows.
- 01
Accurate anthropometry and charting - Why
- Assess growth position and trajectory.
- Interpretation and limitations
- Use correct equipment, exact age, sex-specific chart and gestational correction; repeat implausible measurements before inference.
- 02
Developmental domain review - Why
- Identify delay, dissociation, abnormal quality or regression.
- Interpretation and limitations
- Combine observation, caregiver report and programme tools across motor, language, sensory and social domains.
- 03
Hearing and vision assessment - Why
- Detect sensory contributors and urgent ocular signs.
- Interpretation and limitations
- Review screening and current function; later impairment can occur despite a normal newborn result.
- 04
Immunisation record check - Why
- Identify missed, delayed or contraindicated doses.
- Interpretation and limitations
- Compare documented product and dates with the current UKHSA schedule and use vaccine-specific catch-up advice.
- 05
Family and safeguarding assessment - Why
- Identify support need and risk of harm.
- Interpretation and limitations
- Integrate history over time, speak privately when necessary and follow local safeguarding pathways rather than relying on one sign.
04Applied reasoningWorked examples connecting principles to decisions.
01Worked case: lost words at 20 monthsTreat regression as a prompt findingA parent reports that a 20-month-old who used several words now uses none and no longer responds consistently to their name.+
- 1Clarify exact skills gained and lost, time course, hearing, social interaction, play, motor function, illness and seizures; observe the child and assess current physical illness and safeguarding context.
- 2Reason that loss of language plus altered response is regression rather than an isolated late milestone; consider hearing loss, neurodevelopmental and neurological causes without assigning a diagnosis from one visit.
- 3Arrange prompt referral to the autism team for language regression before age 3, alongside formal hearing evaluation and coordinated developmental assessment. This referral does not establish an autism diagnosis. Escalate urgently for seizures, acute weakness, altered consciousness or rapid further loss.
- 4Verify referral receipt, document baseline skills and parental videos or examples when appropriate, arrange a named review and actively follow non-attendance because delay could affect investigation and support.
02Growth concernConfirm measurement then assess mechanismA plotted weight appears to have crossed centile spaces.+
- 1Repeat measurement with correct equipment and plot exact age on the appropriate chart.
- 2Review length or height, head growth, feeding, illness, development and family pattern.
- 3Follow current faltering-growth guidance, arrange targeted tests or referral and monitor trajectory at a defined interval.
03Missed immunisationUse the current catch-up scheduleThe record shows an interrupted routine vaccine course.+
- 1Verify products, dates, age, clinical risk and any genuine contraindication.
- 2Check the current Green Book and UKHSA catch-up schedule rather than restarting by default.
- 3Administer or arrange indicated doses with consent, documentation and a plan for completion.
05Checking understandingVerify the reasoning, revisit uncertainties and apply feedback.
- Plot serial growth on the same appropriate chart and review trajectory.
- Track developmental referrals, hearing and vision assessments to outcome.
- Recheck current immunisation schedule and complete catch-up doses.
- Follow parental mental-health and family-support referrals with consent and safeguarding awareness.
- Actively pursue missed necessary appointments when delay creates risk.
- Document whether concerns resolve, persist, broaden or regress at each contact.
06Special situationsVariants, exceptions and circumstances that change the usual approach.
Milestones are ranges
A single later achievement can be normal; regression, multiple domains and movement quality are more discriminating.
Age accuracy matters
Plotting or interpreting development with the wrong chronological or corrected age can create false reassurance or concern.
Screens are time limited
A normal newborn hearing or physical screen does not exclude a condition that develops or becomes detectable later.
Concern is evidence
A specific caregiver report deserves exploration even when the child appears settled during a short appointment.
Universal plus targeted
Every family receives the core programme while intensity and coordination increase with identified need.
07Common pitfallsFrequent interpretation and management errors.
- 01
Do not reassure developmental regression as normal variation.
- 02
Do not interpret one unverified measurement without repeating technique.
- 03
Do not use a developmental checklist without observing quality and context.
- 04
Do not assume normal newborn screening excludes later hearing or visual impairment.
- 05
Do not restart an interrupted vaccine course without checking current vaccine-specific guidance.
- 06
Do not use minor illness as a blanket vaccine contraindication.
- 07
Do not blame a child for appointments they were not brought to.
- 08
Do not leave a high-risk referral without active tracking.