As per the guidelines, babies have to be exclusively breast fed till 6 months of age...Water and weaning foods are to be started ideally after 6 months...Also milk has a huge concentration of water..So dont worry about dehydration in summers..
Health Tips
1) keep a watch on the urine output..2) Urine output gives you the idea of the hydration status of your child..3) The baby should pass urine atleast 6-8 times..Take care..!!