How much water should a toddler drink?
Most toddlers only need about 8 to 32 ounces (roughly half a cup to one cup) of plain water a day, on top of the fluids they get from milk and food. This can go up if it's hot out or your child is very active.
Toddlers get most of their hydration from breast milk, formula, cow's milk, and food, so extra plain water needs are small compared to adults.
Good
Based on consensus recommendations from national pediatric and nutrition organizations rather than a controlled trial, so it reflects expert guideline consensus more than experimental proof.
What the evidence says
For toddlers around 12 to 24 months old, both the CDC and the American Academy of Pediatrics suggest offering about 8 to 32 ounces of plain water a day, alongside their regular milk and meals. This is meant to top up hydration, not replace milk or formula, which still provide most of the calories and nutrients toddlers need at this age.
Canadian guidance (Caring for Kids/CPS) notes that fully breastfed babies don't need extra water, and once a baby starts solid foods, water can be offered occasionally in an open cup, especially between meals if your child seems thirsty.
How much a toddler needs isn't a strict number - it depends on their size, activity level, and the weather. An AAP nutrition expert has noted that kids need more water when it's hot or when they're very active outside, so it's fine to offer extra water in those situations.
A simple approach: offer water with meals and snacks, and let your toddler drink to their own thirst cues rather than forcing a specific amount, unless a doctor has told you otherwise for a medical reason.
Sources
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Guideline
Recommended Drinks for Children Age 5 & Younger
HealthyChildren.org (AAP), 2023
AAP guidance on water, milk, and juice amounts for young children.
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Guideline
Feeding your baby in the first year
Caring for Kids (Canadian Paediatric Society), 2024
Canadian guidance: breastfed babies don't need extra water; offer occasionally after starting solids.
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Guideline
Healthy Beverage Quick Reference Guide
AAP, 2019
Details milk and water intake targets by age for 0-5 years.
✓Reviewed by CH, MD, FRCPC
Reviewed by a specialist physician certified by the Royal College of Physicians and Surgeons of Canada, who has read this answer against the sources listed above and confirmed it reflects them. That is not medical advice about your child. How we review
Answer checked October 22, 2026