When can babies drink water and how to offer it

Drinking enough water is essential for optimal health and well-being. At birth, babies have the largest percentage of body water, about 78% []. By the time they reach 1 year of age, that number decreases to about 65%. 

But what does this mean for babies? Should they be drinking water throughout the day like the rest of us? The answer depends on your baby’s age! In this article, we’ll walk you through when is an appropriate time to offer your baby water, give you info about how much they need, and give you tips for ensuring your little one gets the hydration they need to grow and thrive.

Why is it important for babies to drink water?

Water is important for everyone, including babies, since it has so many vital functions in the body like carrying nutrients, lubricating joints, and regulating digestion and body temperature. As adults, we usually think of meeting our water needs by assessing the amount of water we drink each day. However, young babies meet their needs a little bit differently. 

Babies under 6 months don’t need any supplemental hydration because breast milk and formula contain all the water they need. The American Academy of Pediatrics says babies can be introduced to water in small amounts starting around 6months [], as breastmilk or formula will remain their main beverage until they reach 1 year. After that, water and are the recommended go-to beverages for kids 1 - 5.

When can I introduce water to my baby?

Babies can begin to have small amounts of water when they start solids at around. Offer a few sips of water from an open cup or straw cup at mealtimes. Any water your baby drinks at this age is meant to get them used to its taste and introduce the skills needed for cup drinking. No need to worry if your baby doesn’t like water at first. It is not intended to replace breast milk or formula, which provides all the water your baby needs.

Why can’t babies under 6 months have water?

Babies younger than 6 months should not be offered water or other liquids besides breast milk or formula. Breast milk and/or formula provide sufficient water for newborns and babies up to 6 months old, even on hot days. Introducing water too early or diluting formula or breastmilk with water can be dangerous for your baby because it affects the balance of electrolytes in the blood [] and can lead to seizures.

How much water should babies drink?

Water needs may vary quite a bit from baby to baby as well as from day to day. Factors such as the weather and activity level can impact hydration needs. Additionally, high water-containing foods such as fruit, vegetables, and soup can also contribute to water intake. 

The best way to know if your baby is adequately hydrated is to watch their diapers. Babies should have at least 6 wet diapers a day to indicate they are adequately hydrated. If you aren’t seeing that, watch for other signs of dehydration and talk to your baby’s pediatrician. 

Use the table below as a general guide for suggested water amounts, and visit for more expert information from leading health organizations, such as the American Academy of Pediatrics, the Academy of Nutrition and Dietetics, and the American Heart Association.

Suggested water amounts for babies

How should I offer water to baby?

At meals and snacks

Start by offering your baby small amounts of water at meals and snacks. This regular practice helps your baby to get used to the taste of plain water and work on cup-drinking skills. We recommend keeping water to about 1 - 2 oz at a time, so it doesn’t displace breast milk or formula (and your baby is less likely to end up soaked in their high chair this way). As your little one’s fine motor skills improve and their solids consumption increases, consider offering a little more water at a time.

In a cup

Offering water in a cup helps babies build lifelong skills such as drinking from a cup or straw. Make sure to choose appropriately sized cups — they need to fit into small hands — and don’t be afraid to help them! Start with small amounts of water and work your way up as baby masters drinking from a cup.

Consider foods

Fruits, vegetables, and anything liquid at room temperature, like soup or popsicles, all contribute to your baby’s overall water intake. Sometimes it may feel like your baby isn’t consuming a lot of liquid, but when you also account for their food intake, you may realize they are getting hydration from lots of sources. 

In a smoothie or popsicle 

Making smoothies or popsicles at home is a fun way to offer water as well as to try new fruits and vegetables. They can be especially useful for babies who need extra calories or nutrients because you can pack a lot in a small amount of volume.

Throughout the day 

When your baby turns 1, you can have water available more frequently throughout the day as you won’t need to worry that water consumption is displacing their breast milk or formula consumption. Place a cup out in the kitchen or playroom and let them know they can drink as needed. 

When should I introduce a cup?

Babies can begin using a cup at about 6 months when they start to eat . Most feeding experts recommend starting with an open cup or a straw cup as these help to strengthen the muscles used for eating and chewing. You may also use another sippy cup as well. Babies will continue to develop their cup-drinking skills through to toddlerhood.

What are signs of dehydration in babies?

Dehydration can be dangerous for a baby and severe cases may require hospitalization. If you suspect your baby might be showing signs of dehydration, it’s best to call your pediatrician right away so they can guide you on what’s best to do. 

Note: Conditions such as fever, vomiting, and diarrhea put your baby at increased risk for dehydration.

According to the American Academy of Pediatrics [], the following are signs of dehydration:

Mild to moderate dehydration:

• Less activity than usual

• Less than six wet diapers a day 

• Less saliva or cracked lips

• Fewer tears when crying

• Sunken soft spot on the head

Severe dehydration (all the symptoms listed above, plus):

• Very fussy or overly sleepy

• Sunken eyes

• Cool, discolored hands and feet

• Wrinkled skin 

• Dry tongue and mouth

• No tears when crying

Takeaway

• Babies under 6 months shouldn't be given water.

• You can introduce water to babies in small quantities around 6 months, when starting solids.

• Keep in mind that breast milk and/or formula remain a child’s primary sources of calories and hydration until 1 year

• After 6 months, water intake recommendations include offering small amounts (1 - 2 oz) at meals, encouraging cup use, considering water-rich foods. Consider having water readily available to your child throughout the day after 12 months. 

• Signs of dehydration include reduced activity, consistently fewer wet diapers, dry mouth, sunken eyes, fussiness, and more. If you’re concerned about your child’s hydration, reach out to their healthcare provider.