Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Acute loss of function or new gait abnormality
Normal milestone variation is gradual; sudden weakness, loss of walking, new ataxia, altered consciousness or prolonged seizure is an acute neurological presentation.
Action: Use ABCDE, check bedside glucose and refer immediately to acute paediatric services for new-onset gait abnormality, focal weakness, encephalopathy or seizure-related deterioration. Establish the last known normal function and whether a skill is truly lost. Do not defer acute assessment to a routine developmental clinic or assume that a prior developmental diagnosis explains a new neurological change.
Synopsis
Assess child development across interacting domains, use milestone ranges and corrected age appropriately, recognise normal variation without false reassurance, and act on delay, asymmetry, sensory concern or loss of acquired skills.
Assess gross motor, fine motor and vision, speech and language, social and emotional, cognition or play, and adaptive or self-care development.
Milestones are age ranges, not pass–fail dates; sequence, quality, symmetry, trajectory and impact matter more than memorising one median age.
Correct developmental age for prematurity, generally until age 2 years for infants born before 32 weeks and until age 1 for those born at 32–36 weeks.
Key red flags
Loss of a previously secure motor, language, social or self-care skill is developmental regression and requires prompt specialist assessment.
Investigation priorities
01
First-line: structured developmental historyFirst stepFirst line
Map acquisition, quality, sequence and any loss across all domains.
02
First-line: play-based developmental observationFirst line
Observe motor, hand, communication, cognition and reciprocity in a low-distress setting.
Management branches
Routine reviewSurvey every domain
A child attends a scheduled health or general clinical review.
Ask parent concerns first and review gross motor, fine motor or vision, language, social, cognitive and adaptive function.
Observe play and interaction, plot growth and head circumference and perform focused sensory and neurological examination.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.