Infant stomach bug without fever: what to know

Gastroenteritis, often called a stomach bug, can cause vomiting, loose stools, tummy cramps, nausea, poor appetite, and tiredness. Fever may be absent, so its absence does not rule out an infection. Rotavirus Infection is one possible cause, although other viruses, food-related illness, or a feeding problem can produce similar symptoms.

The main concern in an infant is fluid loss. Watch for a dry mouth, fewer wet nappies, no tears when crying, sunken eyes or soft spot, cool hands and feet, unusual sleepiness, or irritability. Abdominal Pain may show as drawing up the legs or crying during feeds, but babies can also be quiet when unwell.

Continue breastfeeding or usual formula, offering small, frequent feeds. Do not dilute formula. If vomiting continues, ask a clinician or pharmacist whether an oral rehydration solution is suitable and how to give it. Avoid juice, fizzy drinks, anti-diarrhoeal medicines, and homemade rehydration mixtures unless a professional specifically recommends them.

Keep a simple record of vomiting, stool changes, feeds, wet nappies, and alertness. Wash hands carefully after nappy changes and clean frequently touched surfaces. Do not force solid food; once vomiting settles, offer familiar foods in small amounts if the infant is ready.

Seek urgent care if the infant cannot keep fluids down, has markedly fewer wet nappies, blood or green material in vomit, blood in stools, a swollen or very painful abdomen, breathing difficulty, a seizure, or is floppy or hard to wake. Contact a clinician promptly if diarrhoea or vomiting is worsening, feeding remains poor, or dehydration is suspected. Use the Fever page for guidance if a temperature develops.

Ask how much fluid the infant should receive, whether an oral rehydration solution is appropriate, and which dehydration signs matter most for your baby. Ask whether the pattern fits Gastroenteritis, Rotavirus Infection, or another problem, and when normal feeds and childcare can resume.