A 20-month-old should drink 1 to 4 cups of water per day (8 to 32 ounces), alongside about 2 cups of whole milk. That’s a wide range, and where your toddler falls within it depends on how much water-rich food they eat, how active they are, and how hot it is outside.
The Recommended Daily Range
For children between 12 and 24 months, the American Academy of Pediatrics recommends 8 to 32 ounces of plain water daily plus 16 ounces (2 cups) of whole milk. That means your 20-month-old’s total beverage intake should land somewhere around 24 to 48 ounces per day from water and milk combined.
The range is broad because toddlers get a surprising amount of hydration from food. Fruits like watermelon, oranges, and strawberries are mostly water. So are foods like yogurt, soup, and cooked pasta. A toddler who eats plenty of these water-rich foods needs less from a cup than one who prefers drier snacks like crackers and bread. On a hot summer day or after a lot of running around, your child will naturally need more.
Why Milk Matters in the Equation
Whole milk counts toward your toddler’s total fluid intake, and it delivers fat, calcium, and vitamin D that a 20-month-old’s growing brain and bones need. The recommended 16 ounces per day is a sweet spot. Going well beyond that, past 24 ounces, can actually cause problems. Too much milk fills a small stomach, crowding out solid foods that supply iron and other nutrients. Over time, excessive milk intake is one of the most common causes of iron deficiency in toddlers. Keeping milk to about 2 cups a day leaves room for both water and a full, varied diet.
What About Juice and Other Drinks?
If you offer juice at all, keep it to no more than 4 ounces of 100% fruit juice per day. Juice has no nutritional advantage over whole fruit. It lacks the fiber, and it can nudge toddlers toward preferring sweet drinks over plain water. It also raises the risk of tooth decay, especially when sipped throughout the day rather than consumed at a single meal.
Sugary drinks, flavored milks, plant-based milks without fortification, and anything with added sweeteners are best avoided entirely at this age. The ideal beverage list for a 20-month-old is short: water, whole milk, and small amounts of juice if you choose to include it.
How to Tell Your Toddler Is Drinking Enough
Counting ounces is one approach, but watching your child’s body gives you a more reliable answer. A well-hydrated 20-month-old should produce at least 6 wet diapers in a 24-hour period. The urine should be pale yellow or nearly clear. If it looks dark or concentrated, your toddler needs more fluids.
Signs of dehydration to watch for include:
- No tears when crying
- Unusual crankiness or low energy
- Skin that doesn’t bounce back quickly when gently pinched
- Fewer than 3 wet diapers in 24 hours, or none in the last 8 hours
If you notice these signs, especially in combination, contact your pediatrician right away. Toddlers can become dehydrated faster than adults because of their smaller body size, and illnesses that cause vomiting or diarrhea accelerate fluid loss quickly.
Practical Tips for Getting Water Into a Toddler
Most 20-month-olds won’t sit down and drink a full cup of water on command. That’s normal. The goal is to make water available and let them sip throughout the day. Keep a small, easy-to-grip cup within reach during meals and snacks. Offer water after active play and before they ask for it, since toddlers often don’t recognize thirst until they’re already a little behind on fluids.
If your child resists plain water, try offering it cold, adding a few frozen berries to make it visually interesting, or switching to a different cup. Some toddlers drink more from a straw cup than an open cup, or vice versa. Avoid turning it into a battle. At this age, consistent access matters more than hitting an exact ounce target at every meal. A toddler who has water available regularly and eats a varied diet with fruits, vegetables, and milk will almost always stay well hydrated without you needing to track every sip.