A: Until babies begin eating solid foods, they typically get all the water they need from breast milk or infant formula. In the first six months of life, it’s usually not necessary—or even desirable—to give extra water to breastfed or bottle-fed infants. After your baby turns six months old, you can start offering her water between feedings, but don’t worry if she rejects it. That’s normally a good sign that a baby is getting all the fluids she needs from breast milk. If your baby is younger than six months old, there’s really no need to even offer her water yet unless your pediatrician specifically recommends it. As long as you allow your baby to nurse regularly throughout the day for as long as she seems hungry and interested, she’s probably getting all the fluids she needs.