Introduction to Infant Hydration Guidelines

Primary Fluid Requirements

Human milk or infant formula provides complete hydration for infants up to 6 months of age and remains the primary fluid source even after 6 months, as stated by the American Academy of Pediatrics 1, 3, 4
The American Academy of Pediatrics explicitly states that no additional fluids are nutritionally necessary for infants under 6 months when adequately breastfed or formula-fed 1, 3, 4

After 6 months of age, when solid foods are introduced, small amounts of plain water can be offered alongside continued breast milk or formula, according to the American Academy of Pediatrics 1, 2
Water should be offered in a cup rather than a bottle to promote proper feeding development and reduce dental risks, as recommended by the American Academy of Pediatrics 3, 4
The amount of water should be modest, as excessive water intake can displace nutrient-dense breast milk or formula, potentially leading to malnutrition, warns the American Academy of Pediatrics 1, 3

Excessive plain water can cause hyponatremia (low blood sodium), which can lead to seizures and other serious complications in infants, according to the American Academy of Pediatrics 3, 4

Offer water in small amounts (a few ounces) with meals once solid foods are introduced, typically around 6 months, recommends the American Academy of Pediatrics 1, 2
Continue prioritizing breast milk or formula as the primary fluid source throughout the first year of life, advises the American Academy of Pediatrics 1, 2
Tap water is acceptable and contributes to fluoride intake for dental health, notes the American Academy of Pediatrics 2

Never give fruit juice to infants under 12 months of age unless specifically indicated for a medical condition like constipation, warns the American Academy of Pediatrics 1, 3, 4, 2
Avoid using water or any liquid other than breast milk/formula in bottles at bedtime to prevent dental caries, recommends the American Academy of Pediatrics 3, 4, 2
Do not allow infants to carry around bottles or cups of water throughout the day, as this can displace nutritional intake, advises the American Academy of Pediatrics 1, 3