A 13-month-old can drink between 1 and 4 cups of water per day (8 to 32 ounces). That’s a wide range because the right amount depends on how much milk your child drinks, how many water-rich foods they eat, and how active or warm they are on any given day. Most toddlers this age do well with 1 to 2 cups of water spread throughout the day alongside their milk and solid foods.
The Recommended Daily Range
For children 12 to 24 months old, the guideline from the American Academy of Pediatrics is 1 to 4 cups of water per day. That range exists because water is only one piece of the hydration picture. The total adequate fluid intake for a 1- to 3-year-old is about 5.5 cups per day from all sources combined. Roughly 30% of that (about 1.7 cups) comes from moisture in solid foods like fruits, vegetables, yogurt, and cooked grains. The remaining 4 cups come from beverages, which includes both water and milk.
So if your 13-month-old is drinking 2 to 3 cups of whole milk per day and eating a variety of solid foods, they only need about 1 to 2 cups of plain water to round out their hydration. On hot days or especially active days, they may want closer to 3 or 4 cups.
How Milk Fits Into the Equation
At 13 months, whole cow’s milk (or a fortified alternative) is a key part of your child’s diet, providing fat, calcium, and vitamin D. The CDC recommends about 2 servings of dairy per day for children 12 to 23 months, which can include milk, full-fat yogurt, and cheese. There’s no single “maximum ounces” rule, but the practical concern is straightforward: if your toddler fills up on too much milk, they won’t be hungry for solid foods that provide iron and other nutrients. Too much milk can also make it harder for their body to absorb iron from food. Keeping milk to around 16 ounces per day leaves plenty of room for water and solid foods.
Can a Toddler Drink Too Much Water?
Water intoxication, where excess water dangerously dilutes sodium levels in the blood, is primarily a concern for babies under 6 months whose kidneys are still immature and whose diet is entirely liquid. By 13 months, your child’s kidneys are much better at regulating fluid balance, and they’re eating solid foods that contain salt and other electrolytes. The risk drops significantly.
That said, it’s still possible to overdo it. If a toddler drinks large volumes of water in a short period, especially in place of meals, sodium levels can dip low enough to cause irritability, drowsiness, or in rare cases, seizures. Sticking within the 1-to-4-cup daily range and offering water in small amounts throughout the day rather than all at once keeps things safe. If your child has vomiting or diarrhea, offer an oral rehydration solution rather than plain water, since their electrolyte balance is already disrupted.
What About Juice?
If you offer 100% fruit juice at all, the AAP recommends no more than 4 to 6 ounces per day for children ages 1 through 6. Juice counts toward total fluid intake, but it adds sugar without the fiber you’d get from whole fruit. Water and milk are the two drinks your 13-month-old actually needs.
Signs Your Toddler Needs More Water
Toddlers aren’t always great at communicating thirst, so it helps to watch for physical signs of dehydration. These include fewer wet diapers than usual, few or no tears when crying, sunken eyes, a soft spot on the head that dips inward, and unusual drowsiness or irritability. If you notice several of these signs together, increase fluid intake and contact your pediatrician if things don’t improve quickly.
A simple habit is offering a small cup of water at each meal and snack. Your child will drink what they need and leave the rest.
Choosing the Right Cup
At 13 months, this is a great time to practice with an open cup. The AAP recommends using sippy cups only as a short-term bridge between bottles and open cups. An open cup (or a cup with a simple snap-on lid) teaches your child to sip rather than suck, which is better for oral development and helps them learn to regulate how much they’re drinking. Spill-proof cups with valves or 360-degree lids may seem convenient, but they encourage a sucking motion that mimics a bottle and don’t build the same skills.
Start with just an ounce or two of water in the cup at mealtimes. Spills are part of the process. Over time, your toddler will get better at controlling the flow, and offering water this way naturally keeps portion sizes small and spread throughout the day, which is exactly the pattern you’re aiming for.