A parent asks
A young breastfed baby needs extra water, especially when it is hot.
Common family advice, especially in hot weather
What the evidence says
For an exclusively breastfed baby under 6 months, WHO says breast milk provides the water the baby needs, including in hot weather. Extra water is not recommended.
Where it gets nuanced
This item is specifically about exclusively breastfed babies. It should not be stretched into advice for every feeding situation or for a baby with a medical concern.
The Harmony Bridge
If your exclusively breastfed baby seems thirsty in hot weather, offer the breast more often rather than routinely giving water. If feeding or hydration seems unusual, seek individual medical advice.
Talking about it at home
If you need to explain this to family
You could say: “I know the worry is that the baby may be thirsty in this heat. WHO guidance says an exclusively breastfed baby under 6 months gets the water they need from breast milk, even in hot weather, so we’re offering feeds more often instead.”
Sources
- Breastfeeding: questions and answersWorld Health Organization
Reviewed by Saha editorial on 2026-10-04. Editorial review does not mean clinician review or medical validation.