Does a baby need water in hot climates?
Babies need breast milk or formula until they are 1 year old at least. You can offer them water around 6 months but they still need breast milk or formula for nutrients.
Breastmilk contains a perfectly balanced ratio of food and water to meet all your baby's needs. It is a living fluid, ever-changing to suit your baby and even in response to the weather! In hot weather a thirsty baby may want to breastfeed more frequently but for shorter periods. In this way he is getting more low-fat milk and so is satisfying his thirst. If you need to be away from your baby, it is preferable that he has your expressed breastmilk.
Bottle-fed babies may need extra formula or small amounts of cool boiled water if they seem thirsty.