Child Water Intake Calculator

At 12–24 months, toddlers need about 32 fl oz (4 cups) of total beverages per day, including milk. Plain water can start being offered freely after 12 months. Whole cow's milk (up to 16–24 oz/day) is the main beverage, with the rest being water.

Children aged 4–8 typically need about 40 fl oz (5 cups) of total beverages daily. On active days or in hot weather, increase by 1–2 cups. Water should be the primary beverage, with milk for calcium and no sugary drinks.

Before 6 months: No. Babies under 6 months get all the hydration they need from breast milk or formula. Giving water to a young infant can cause dangerous electrolyte imbalances (water intoxication). After 6 months, small sips of water with solid foods are fine (about 2–4 oz/day).

Watch for: fewer wet diapers or urinations, dark yellow or amber urine, dry lips and mouth, no tears when crying, sunken eyes or fontanelle in infants, unusual lethargy, or decreased skin elasticity. Mild dehydration can worsen quickly in young children — offer fluids frequently.

Yes. Milk is about 87% water and counts toward total daily fluid intake. So does juice (though it should be limited). Foods also contribute about 20% of daily water needs — fruits, vegetables, soups, and yogurt all contain significant water.

Try: offering a fun water bottle they choose themselves, adding slices of fruit (lemon, strawberry, cucumber) for natural flavor, setting regular drinking times (with meals and snacks), making it the default option instead of juice, and modeling water drinking yourself.