This sounds like acute gastroenteritis / food poisoning, which is common after outside food.
Loose stools for 3 days and a single episode of vomiting without pain or fever usually indicates a mild infection or food-related irritation.
The most important treatment is rehydration. Breastfeeding should be continued — it is safe and beneficial for the baby.
⚠️ Avoid
• Anti-diarrheal drugs like loperamide unless advised
• Self-starting antibiotics (often not needed and can worsen symptoms)
Next Steps
• Increase fluids: ORS, water, rice water, soup
• Light diet: banana, rice, curd, toast
• Monitor for dehydration (low urine, dry mouth, dizziness)
• If loose stools persist >5 days, fever appears, blood in stool, or vomiting increases → consult immediately
Health Tips
• Continue breastfeeding normally
• Wash hands well to avoid spread
• Avoid outside food until fully recovered