A 13-month-old needs about 1 to 4 cups of water per day (8 to 32 ounces), alongside whole milk and solid foods. That’s a wide range because every toddler’s appetite, activity level, and diet differ. Most 13-month-olds do well with a few small cups of water spread throughout the day, especially at meals and snacks.
How Water and Milk Fit Together
At 13 months, water and whole milk are the only two drinks your toddler really needs. Water is for hydration between and during meals, while whole milk provides fat, calcium, and vitamin D that support rapid growth. The goal is balancing the two so neither one crowds out solid food, which should be your child’s main source of nutrition by now.
Children 12 to 23 months need about 2 servings of dairy per day. That can come from whole cow’s milk, full-fat yogurt, or cheese. If most of those dairy servings come from milk, roughly 16 ounces (2 cups) per day is a reasonable target. Going much beyond that can backfire: toddlers who drink too much cow’s milk often lose their appetite for other foods, and excess milk can interfere with iron absorption from the meals they do eat.
A practical daily picture might look like 2 cups of whole milk plus 1 to 3 cups of water, adjusted to your child’s thirst and how much moisture they get from food. Fruits like watermelon, strawberries, and oranges, along with cooked vegetables, soups, and yogurt, all contribute fluid that counts toward hydration even though it’s hard to measure precisely.
What About Juice and Other Drinks?
The AAP recommends no more than 4 ounces of 100% fruit juice per day for children ages 1 through 3. That’s half a cup, and it’s a maximum, not a goal. Juice adds sugar and calories without the fiber you get from whole fruit, so many pediatricians suggest skipping it entirely at this age. Flavored milks, plant milks that aren’t fortified, soft drinks, and sweetened beverages aren’t appropriate for a 13-month-old.
Switching from Bottles to Cups
If your toddler is still using a bottle, now is a good time to start transitioning. Toddlers who keep bottles well into their second year are more likely to skip meals (because sipping a bottle throughout the day blunts hunger), develop cavities from teeth being constantly bathed in milk, and take in excess calories that can lead to unhealthy weight gain. Prolonged bottle use has also been linked to tooth alignment problems and speech delays, since the muscles used for sucking are different from those needed for clear speech.
You can go straight to an open cup, use a cup with a straw, or try a sippy cup as a bridge. If you use a sippy cup, pick one without a no-spill valve. Valved sippy cups force kids to suck the same way they would on a bottle, which defeats the purpose. Look for a simple spouted lid with two handles. The goal is for your child to drink from an open cup by around age 2, but plenty of toddlers skip the sippy stage entirely.
Signs Your Toddler Isn’t Getting Enough
Toddlers aren’t great at telling you they’re thirsty, so it helps to know what mild dehydration looks like. Early signs include a dry mouth, fewer tears when crying, less frequent urination (fewer than six wet diapers in 24 hours), a sunken soft spot on the head, and playing less than usual.
More severe dehydration shows up as extreme fussiness or unusual sleepiness, sunken eyes, cool or discolored hands and feet, wrinkled skin, and urinating only once or twice a day. Hot weather, active play, and illness (especially vomiting or diarrhea) all increase fluid needs. During a stomach bug, plain water alone isn’t the best choice. An oral rehydration solution replaces both water and the electrolytes your child is losing, which plain water can’t do.
Can a Toddler Drink Too Much Water?
It’s rare, but water intoxication can happen when a young child takes in far more water than their small kidneys can process. This dilutes sodium levels in the blood and causes cells, particularly brain cells, to swell. Symptoms include irritability or unusual drowsiness, low body temperature, puffiness, and in serious cases, seizures. For a 13-month-old, staying within the 1 to 4 cup daily range and offering water in small amounts at meals rather than letting them chug freely from a bottle keeps the risk essentially zero.
Practical Tips for Offering Water
Offer a small open cup or straw cup of water at every meal and snack. Let your toddler decide how much to drink. You don’t need to track ounces precisely. If your child is eating a variety of fruits and vegetables, producing plenty of wet diapers, and seems energetic and content, they’re almost certainly getting enough fluid.
On hot days or when your toddler is especially active, offer water more frequently. Keep a cup accessible during play so they can take sips. If your child resists plain water, try serving it slightly cool or offering it alongside a favorite food. Most toddlers warm up to water quickly once it’s a consistent part of their routine.