{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.low-birth-weight-infant","code":"thing-q6692979","url":"https://ver.cy/models/thing/q6692979/","name":"low birth weight infant","alternateNames":["small for gestational age","very low birth weight infant"],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Information and virtual systems","entryKind":"thing","plane":"INF","domain":["INF.KNW"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A low birth weight infant is a live-born infant whose weight at birth is less than 2,500 grams, irrespective of gestational age.","purpose":"Enable an agent to recognise an infant born with low birth weight, distinguish the basis of that classification, and support assessment, care coordination and follow-up.","scope":{"in":["Birth-weight measurement, provenance and classification uncertainty","Relationship between low birth weight, gestational maturity and size for gestational age","Current physiological stability and support requirements","Feeding, thermal care and growth assessment","Caregiver participation, discharge readiness and longitudinal follow-up"],"out":["Complete models of prematurity, fetal growth restriction or small-for-gestational-age status","Maternal conditions and antenatal interventions as independently managed entities","Detailed diagnosis and treatment protocols for individual neonatal diseases","Specifications of incubators, feeding equipment or monitoring devices","Population prevalence and public-health programme management","General infant development unrelated to birth-weight-associated assessment"],"boundaries":[]},"distinguishingFeatures":["An infant qualifies when birth weight is below 2500 g, irrespective of gestational age; exactly 2500 g does not meet this threshold. [WHO definition](https://www.who.int/teams/maternal-newborn-child-adolescent-health-and-ageing/newborn-health/preterm-and-low-birth-weight/)","Prematurity concerns gestational age below 37 completed weeks; low birth weight concerns mass at birth, so the classifications must be assessed separately. [WHO definitions](https://www.who.int/teams/maternal-newborn-child-adolescent-health-and-ageing/newborn-health/preterm-and-low-birth-weight/)","Assessment must distinguish an absolute birth-weight threshold from small-for-gestational-age classification using a declared reference distribution.","A later weight below 2500 g does not by itself establish low birth weight, and subsequent growth above 2500 g does not erase the birth history.","Low birth weight alone does not establish fetal growth restriction, a particular disease or a particular level of clinical instability."],"structure":{"bundles":[{"id":"birth-weight-classification","name":"Birth-weight classification","description":"Establish whether the infant meets the birth-weight criterion and whether the evidence is reliable.","layers":[{"id":"threshold-membership","name":"Threshold membership","description":"Apply the stated definition to the recorded birth weight.","findings":[{"id":"classification-decision","name":"Classification decision","description":"Record the weight, applicable definition and supported or unresolved classification.","questions":[{"text":"Does the documented birth weight fall below 2500 g?","id":"classification-decision-q01","kind":"definition"},{"text":"Could rounding, unit conversion or conflicting values change threshold membership?","id":"classification-decision-q02","kind":"boundary"}]}]},{"id":"measurement-provenance","name":"Measurement provenance","description":"Assess how the value designated as birth weight was obtained.","findings":[{"id":"birth-weight-evidence","name":"Birth-weight evidence","description":"Preserve the original record, timing, method and uncertainty of the measurement.","questions":[{"text":"Which birth record identifies the infant and supplies the original weight, units and measurement time?","id":"birth-weight-evidence-q01","kind":"provenance"},{"text":"Was the infant weighed directly, and what is known about the scale, precision and delay after birth?","id":"birth-weight-evidence-q02","kind":"measurement"},{"text":"If birth weight is unavailable, how will suspected status remain distinct from verified status?","id":"birth-weight-evidence-q03","kind":"action"}]}]}]},{"id":"maturity-and-growth-context","name":"Maturity and growth context","description":"Describe gestational maturity and growth context without inferring either from weight alone.","layers":[{"id":"gestational-maturity","name":"Gestational maturity","description":"Establish gestational age and the reliability of dating.","findings":[{"id":"independent-prematurity-assessment","name":"Independent prematurity assessment","description":"Record whether prematurity is independently established and link its detailed assessment.","questions":[{"text":"What gestational age was assigned at birth, using which dating evidence?","id":"independent-prematurity-assessment-q01","kind":"provenance"},{"text":"Does uncertainty in gestational dating prevent a reliable maturity classification?","id":"independent-prematurity-assessment-q02","kind":"boundary"}]}]},{"id":"relative-size-and-growth-history","name":"Relative size and growth history","description":"Separate observed size from evidence of restricted fetal growth.","findings":[{"id":"size-versus-growth-restriction","name":"Size versus growth restriction","description":"Record reference-based size classification and independently documented growth-restriction evidence.","questions":[{"text":"Which reference, gestational age and sex-specific parameters determine the birth-weight centile?","id":"size-versus-growth-restriction-q01","kind":"measurement"},{"text":"What antenatal or clinical evidence supports growth restriction beyond a small birth size?","id":"size-versus-growth-restriction-q02","kind":"provenance"},{"text":"Which causal explanations remain hypotheses rather than established diagnoses?","id":"size-versus-growth-restriction-q03","kind":"boundary"}]}]}]},{"id":"physiological-stability","name":"Physiological stability","description":"Organise current observations concerning breathing, temperature regulation and acute illness.","layers":[{"id":"respiratory-and-thermal-state","name":"Respiratory and thermal state","description":"Capture observed stability alongside the support required to maintain it.","findings":[{"id":"support-dependent-stability","name":"Support-dependent stability","description":"Distinguish stable observations under support from demonstrated ability to remain stable with less support.","questions":[{"text":"What recent breathing and temperature observations were recorded, with which respiratory and thermal support?","id":"support-dependent-stability-q01","kind":"measurement"},{"text":"What clinician-defined changes require reassessment, escalation or transfer?","id":"support-dependent-stability-q02","kind":"action"}]}]},{"id":"acute-concerns-and-escalation","name":"Acute concerns and escalation","description":"Track suspected complications separately from confirmed diagnoses.","findings":[{"id":"unresolved-clinical-concerns","name":"Unresolved clinical concerns","description":"Record concerns such as infection, glucose disturbance or jaundice through linked assessments rather than assuming them from low weight.","questions":[{"text":"Which symptoms, examination findings or test results support each current concern?","id":"unresolved-clinical-concerns-q01","kind":"provenance"},{"text":"Which concerns are suspected, confirmed, excluded or awaiting reassessment?","id":"unresolved-clinical-concerns-q02","kind":"boundary"},{"text":"Who is responsible for the next assessment, and what local protocol determines urgency?","id":"unresolved-clinical-concerns-q03","kind":"action"}]}]}]},{"id":"feeding-and-postnatal-growth","name":"Feeding and postnatal growth","description":"Connect observed feeding capability, prescribed nutritional provision and serial growth.","layers":[{"id":"feeding-capability-and-provision","name":"Feeding capability and provision","description":"Describe the infant's feeding performance and the plan used to meet nutritional needs.","findings":[{"id":"feeding-plan-fit","name":"Feeding-plan fit","description":"Record milk source, feeding route, assistance, prescribed intake and observed tolerance.","questions":[{"text":"What observed feeding performance supports the current route and assistance level?","id":"feeding-plan-fit-q01","kind":"measurement"},{"text":"What intake is prescribed and actually received, and how are unmeasured feeds represented?","id":"feeding-plan-fit-q02","kind":"measurement"},{"text":"Which tolerance concerns or supply barriers require review of the feeding plan?","id":"feeding-plan-fit-q03","kind":"action"}]}]},{"id":"growth-interpretation","name":"Growth interpretation","description":"Interpret serial anthropometry with explicit timing, measurement quality and reference selection.","findings":[{"id":"interpretable-growth-series","name":"Interpretable growth series","description":"Preserve growth observations and the basis for judging their significance.","questions":[{"text":"What are the dated weight, length and head-circumference measurements, and are methods comparable?","id":"interpretable-growth-series-q01","kind":"measurement"},{"text":"Which growth reference and chronological, corrected or postmenstrual age basis are used?","id":"interpretable-growth-series-q02","kind":"definition"},{"text":"Which observed trajectory changes trigger clinical or nutritional reassessment under the applicable protocol?","id":"interpretable-growth-series-q03","kind":"action"}]}]}]},{"id":"care-continuity-and-family-support","name":"Care continuity and family support","description":"Record how caregivers and services sustain the infant's care through admission, discharge and follow-up.","layers":[{"id":"caregiver-supported-care","name":"Caregiver-supported care","description":"Identify the practical arrangements for participation in feeding, thermal care and observation.","findings":[{"id":"family-care-capacity","name":"Family care capacity","description":"Record caregiver availability, instruction, demonstrated skills and support needs, including the documented kangaroo mother care plan where applicable.","questions":[{"text":"Who can provide the planned feeding and skin-to-skin care, and what instruction or assistance do they need?","id":"family-care-capacity-q01","kind":"action"},{"text":"What practical barriers limit participation, and which service is responsible for addressing them?","id":"family-care-capacity-q02","kind":"action"}]}]},{"id":"discharge-and-follow-up","name":"Discharge and follow-up","description":"Connect readiness evidence to an executable transition and surveillance plan.","findings":[{"id":"supported-transition","name":"Supported transition","description":"Record clinician-approved readiness criteria, remaining dependencies and the receiving care arrangement.","questions":[{"text":"What evidence satisfies the applicable feeding, thermal, respiratory and caregiver readiness criteria?","id":"supported-transition-q01","kind":"boundary"},{"text":"Which follow-up appointments, referrals and routes for urgent reassessment are confirmed?","id":"supported-transition-q02","kind":"action"}]},{"id":"longitudinal-risk-review","name":"Longitudinal risk review","description":"Preserve low-birth-weight history while updating present growth, development and screening needs.","questions":[{"text":"Which growth, developmental or screening assessments are indicated by this infant's complete clinical profile?","id":"longitudinal-risk-review-q01","kind":"action"},{"text":"When should this specialised follow-up end or transfer, and how will the birth history remain accessible?","id":"longitudinal-risk-review-q02","kind":"boundary"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these standards and regulation hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-regional-variation-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of low birth weight infant this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Explain the low birth weight definition and its causes from public health sources.","Record birth weights in health systems it is authorized to use."],"mustNot":["Blame parents for low birth weight.","Advise on infant feeding or care in place of the clinical team.","Disclose infant health records without consent.","Confuse low birth weight with preterm birth in records."],"requiresHuman":["Any medical decision about an infant."]},"ethics":{"considerations":["Low birth weight reflects poverty, maternal health and inequality, not only individual choices.","Parents of small babies face stress and stigma."],"affectedParties":["Infants","Parents","Health workers"]},"owners":{"steward":"The infant's parents or guardians; health services record births.","roles":[],"masterSystems":["Birth registers","Patient health records"]},"relations":[{"target":"Q102187407","type":"parent","note":"registry parent class"},{"target":"Q1497481","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.low-birth-weight-infant","Wikidata: Q6692979 (https://www.wikidata.org/wiki/Q6692979)"]},"properties":{"applicability":"not-applicable","items":["Birth weight: g; retain original recorded value and precision","Birth-weight evidence quality: Documented measurement; reported value; estimate; conflicting records; unavailable","Birth-to-weighing interval: Minutes or hours after birth; unknown permitted","Gestational age at birth: Completed weeks and days, with dating method and uncertainty","Size for gestational age: Small; appropriate; large; indeterminate; record reference and cutoff","Current physiological support: Documented respiratory, thermal and feeding support, each with assessment time","Feeding capability: Observed oral feeding effectiveness, prescribed route and assistance requirements","Growth trajectory: Serial weight in g, length and head circumference in cm, with dates and age basis","Responsible care network: Links to caregivers, accountable clinical team, referral service and follow-up provider"]},"recognition":{"applicability":"optional","items":["Settled by weighing at birth: under 2,500 grams.","Not by appearance alone."]},"capabilities":{"applicability":"required","items":["Check whether documented birth-weight evidence supports classification and flag unresolved threshold cases.","Separate low birth weight from prematurity and growth-related classifications.","Summarise observed instability and outstanding assessments for clinical review.","Track prescribed feeding, thermal support and caregiver participation against documented needs.","Compare serial growth observations using a declared reference and age basis.","Coordinate discharge and follow-up while preserving birth history and unresolved concerns."]},"hazards":{"applicability":"required","items":["Small babies are at higher risk of infection, low temperature and feeding problems.","Long-term health and development can be affected."]},"interfaces":{"applicability":"required","items":["International Classification of Diseases (ICD-11), World Health Organization."]},"context":{"applicability":"required","items":["This classification is used in maternity and neonatal services to identify liveborn infants whose measured birth weight is below 2500 grams, regardless of gestational age.","It supports care coordination, follow-up and public health reporting, while additional assessment distinguishes prematurity from restricted fetal growth."]}},"sources":[{"title":"Wikidata item Q6692979: low birth weight infant","url":"https://www.wikidata.org/wiki/Q6692979","note":"identity and sense of the item"},{"title":"Wikipedia: Low birth weight","url":"https://en.wikipedia.org/wiki/Low_birth_weight","note":"general description of the item"}],"openQuestions":["Which local policy governs classification when the first reliable weight was measured late or the recorded birth weight was rounded near 2500 g?","Which birth-size and postnatal growth references should apply across the populations and gestational ages served?","How should the registry distinguish the current infant classification from a historical low-birth-weight attribute after infancy?","Which validated local protocols determine escalation, discharge readiness and follow-up intensity for term versus preterm low-birth-weight infants?","Does an existing Vercy world model already own this concept, requiring this registry entry to link to it instead of creating a separate publication?"],"resources":{"spec":"/models/things/publications/thing-q6692979/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q6692979/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T11:03:21Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:32+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane INF: no invented physical properties."},"score":1.0}}