A 13-month-old needs roughly 1 to 4 cups of water per day (8 to 32 ounces), depending on how much milk they’re drinking, what they’re eating, and how active they are. That’s a wide range because water isn’t your toddler’s only source of hydration at this age. Milk, fruits, soups, and other foods all contribute fluid, so the amount of plain water they actually need varies from child to child.
The Recommended Range
For children between 12 and 24 months, the guideline from the American Academy of Pediatrics is 1 to 4 cups of water daily. Most 13-month-olds fall on the lower end of that range, closer to 1 or 2 cups, because they’re still getting a significant amount of their fluids from whole milk. A child drinking more milk will naturally need less plain water, and vice versa.
One practical rule of thumb: offer water at meals and snacks, and let your toddler drink as much as they want. You don’t need to force a specific number of ounces. At this age, the goal is building the habit of drinking water regularly rather than hitting an exact daily target.
How Milk Fits Into the Picture
Whole milk is a major part of your 13-month-old’s diet, but it has an upper limit. Toddlers should drink no more than 16 to 24 ounces of milk per day. Going above that can interfere with iron absorption and fill them up so they eat less solid food, which means they miss out on the fiber and nutrients those foods provide.
Think of milk and water as complementary. If your toddler drinks about 16 ounces of milk in a day, they’ll likely need more water to stay hydrated. If they’re closer to 24 ounces of milk, their water needs drop accordingly. Either way, water should be the go-to drink between meals.
What About Juice?
Fruit juice is fine in small amounts after age 1, but the limit is 4 ounces per day, and it should be 100% fruit juice with no added sugar. That’s about half a cup. Juice shouldn’t be served in sippy cups or bottles that your toddler carries around all day, because constant sipping exposes their teeth to sugar and can lead to decay. If you offer juice, serve it in a cup at a meal or snack, then put it away.
Water is always a better choice for general thirst. Juice adds calories and sugar without much benefit beyond what your toddler gets from eating whole fruit.
When Your Toddler Needs More
Hot weather and active play increase your child’s fluid needs. When your toddler comes inside sweaty from playing outdoors, offer a cold glass of water. You don’t need to calculate exact extra ounces. Just make water available more often on hot days, during illness (especially if there’s vomiting or diarrhea), and anytime your child seems more active than usual.
Fever also increases fluid loss. If your toddler is sick, offering small sips of water frequently throughout the day helps more than trying to get them to drink a large amount at once.
Signs Your Toddler Is Getting Enough
The easiest way to check hydration is to look at diapers and urine color. A well-hydrated toddler produces at least 3 wet diapers a day (or uses the toilet at least 3 times), and their urine is pale yellow. Dark yellow, strong-smelling urine is a sign they need more fluids.
Other signs of dehydration to watch for include:
- Few or no tears when crying
- A dry mouth, lips, or tongue
- Sunken eyes
- Unusual drowsiness or irritability
- A sunken soft spot on top of the head
Mild dehydration is common and easy to correct by offering more fluids. But if your toddler seems unusually sleepy, has very few wet diapers, or shows no tears when crying, that warrants prompt medical attention.
Cups, Not Bottles
At 13 months, your toddler should be transitioning away from bottles if they haven’t already. The AAP recommends starting to introduce a cup around 6 months and completing the switch between 12 and 18 months. You can use a sippy cup, a straw cup, or even an open cup, whatever your child takes to. Sippy cups are fine as a training tool, but the goal is drinking from an open cup by around age 2.
One thing to avoid: letting your toddler carry a cup around all day like a comfort object. Kids who sip constantly tend to drink too much overall and feel less hungry at meals. Instead, offer cups at mealtimes and snack times. If your child is thirsty between meals, give them a little plain water, then set the cup aside until the next eating opportunity.
Can a Toddler Drink Too Much Water?
Water intoxication is rare in toddlers over 12 months, but it can happen if a child drinks very large amounts of water in a short time. This dilutes sodium levels in the blood and can cause serious symptoms. In practice, a 13-month-old who drinks water at meals and sips a bit between meals is not at risk. The concern applies more to infants under a year, whose small bodies and exclusive milk diets make them much more vulnerable.
Staying within the 1 to 4 cup range and offering water at natural intervals throughout the day keeps things safe. If your toddler seems to crave unusually large amounts of water, that’s worth mentioning to your pediatrician, as excessive thirst can occasionally signal an underlying issue.