Drinks · 5 min read · 4 May 2026
When Can Babies Have Water? A Gentle Guide for Parents
It’s a question every new parent asks. We'll walk you through the surprising answer to 'when can babies have water?' and how to offer it safely.
As you begin your journey with solid foods, you’ll naturally have questions about drinks. One of the most common we hear from parents is, 'when can babies have water?' It feels like a simple question, but the answer is deeply tied to your baby's unique nutritional needs and developmental stage.
For the first six months of life, a baby does not need any water. Major health organizations like the World Health Organization (WHO) and the American Academy of Pediatrics (AAP) are clear that breast milk or infant formula provides all the hydration a baby needs. Their amazing compositions adjust to meet your baby's fluid requirements, even in hot weather.
The primary reason to wait is a matter of nutrition and tiny tummies. A young baby's stomach is very small, and filling it with water can displace the precious calories, fats, and nutrients they get from milk. Breast milk or formula is a complete food, and water is simply empty volume for an infant who needs every bit of nourishment.
There is also a gentle safety consideration. In rare cases, giving too much water to a baby under six months can lead to a serious condition called water intoxication, or hyponatremia. Their immature kidneys aren't equipped to handle large amounts of plain water, which can dangerously dilute the sodium levels in their system.
Once your baby reaches about six months old and you begin introducing solid foods, you can start offering small amounts of water. This is a great time to introduce an open cup or a straw cup. You can begin by offering just a few sips, around 1-2 ounces (30-60 ml), during a meal.
The focus at this stage is more on learning the skill of drinking from a cup than on hydration itself. According to the AAP, from 6 to 12 months, you can offer about 4 to 8 ounces (120-240 ml) of water per day. Remember that breast milk or formula should still be their main source of hydration a little while longer.
Many parents wonder if babies who drink formula need extra water, and the answer is no. It is crucial to always mix powdered formula exactly according to the manufacturer's instructions. Adding extra water dilutes the nutritional content and can be very dangerous for your baby.
As your baby graduates to toddlerhood around their first birthday, their needs change once again. After 12 months, you can offer water more freely between meals, and it can become a primary beverage alongside whole milk. This transition helps establish healthy, lifelong hydration habits, prioritizing water over sugary juices.
Trust your instincts and observe your baby's cues. Introducing water is a gentle process, not a race. By starting small around six months, you empower them to learn a new skill while ensuring their primary nutritional needs are always met by their milk.
Navigating the nuances of when can babies have water is a perfect example of how baby-led feeding is a journey of learning together. This information is meant to be educational, and we always encourage you to discuss your baby's specific needs and feeding plan with your pediatrician.