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Formula feeding and safe preparation

Essential points for quick revision.

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Illness after formula feeding

Fever or hypothermia, lethargy, poor perfusion, repeated vomiting, bloody diarrhoea, reduced urine, seizures or respiratory difficulty can indicate invasive infection, dehydration, electrolyte disturbance or aspiration.

Action: Stop the current feed, assess airway, breathing, circulation, temperature, glucose and hydration and arrange urgent paediatric review. Retain packaging, batch details and preparation history when contamination is possible and follow UKHSA or Food Standards Agency alerts. Treat shock, sepsis, hypernatraemia or aspiration through the relevant pathway; do not attempt correction by making the next bottle weaker or stronger.

Synopsis

Support formula and mixed feeding without judgement, select an age-appropriate product, prepare powdered formula with water at least 70°C, prevent dilution and contamination errors, use responsive bottle technique, and recognise feeding or illness red flags.

  • First infant formula is nutritionally suitable as the main milk from birth to 12 months; follow-on formula is not required and should not be given before 6 months.
  • Powdered formula is not sterile. Wash hands, disinfect the surface and wash and sterilise bottles, teats and preparation equipment before each feed until at least 12 months.
  • First-line safe method: make one feed at a time with fresh cold tap water that has been boiled once and cooled for no more than 30 minutes, so it remains at least 70°C.

Key red flags

A baby who is difficult to wake, persistently refuses feeds, has fever or hypothermia, respiratory distress or poor perfusion needs urgent assessment.

Investigation priorities

01
First-line: observed formula preparationFirst stepFirst line

Identify temperature, ratio, hygiene and storage errors that history alone may miss.

Management branches

RoutinePrepare one safe feed

Powdered first infant formula is being prepared at home.

  1. Wash hands, disinfect the surface and assemble washed sterilised equipment.
  2. Boil at least 1 litre of fresh cold tap water, cool no more than 30 minutes, measure water first and add exact level scoops.
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Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending
Sources

Sources and review status

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.

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom