A: Breast milk and formula are mostly water, so additional water bottles are not necessary for a young infant, nor are they recommended. Babies fall asleep when their tummies are full, regardless of what is in there. If your baby misses a feeding because he is full of water, he won't be getting the nutrition he needs.

If you are concerned your baby might dehydrate in hot weather, look for these signs:

• Lack of energy
• Dark yellow urine in the diapers
• Skin that is not plump
• If you notice any of these symptoms, call your pediatrician immediately and try to breastfeed or give a bottle of formula.