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6 months girl, vomiting x 3, no fever, mild dehydration. Management?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MSt MRCGP.

Posted: 6 November 2026Updated: 6 November 2026 Guideline-Aligned (High Confidence) Clinically Reviewed

Use low-osmolarity oral rehydration solution (ORS) as first-line treatment for mild dehydration, rather than intravenous fluids, provided she can tolerate oral fluids .

  • Offer small, frequent amounts by spoon rather than large drinks, aiming for initial rehydration over approximately 4–6 hours .
  • Continue breastfeeding during rehydration, and resume usual age-appropriate feeds during or immediately after rehydration; formula does not normally need dilution or replacement .
  • Use ORS rather than fruit juice or fizzy drinks, which have an unsuitable composition for rehydration and may worsen diarrhoea .
  • Reassess hydration and oral intake after about 4 hours, monitoring urine output, alertness and circulation .
  • Arrange urgent hospital assessment if she cannot retain ORS, deteriorates, develops altered consciousness or signs of shock, or fails to improve after adequate oral rehydration; intravenous treatment is reserved for severe dehydration or failed oral therapy .

Routine antiemetics are not recommended for infant gastroenteritis; the immediate priority is fluid replacement .

Key References

Educational content only. Always verify information and use clinical judgement.