Babies should not drink water at all before 6 months old. During the first six months, breast milk or formula provides all the hydration they need. Giving water to babies under 6 months can cause diarrhea, malnutrition, or electrolyte imbalances because it may reduce their intake of breast milk or formula, which contain essential nutrients and hydration. Once a baby reaches about 6 months old and starts eating solid foods, you can start offering small amounts of water, usually about 4 to 8 ounces a day. Water at this stage helps the baby get used to its taste and develop drinking skills like using a sippy cup, but it should not replace breast milk or formula, which remain their main source of nutrition and fluids until 12 months old. It's important to ensure the water is safe for the baby—tap water should be boiled and cooled if its quality is uncertain, or bottled water can be used if unopened and safe. The introduction of water is a gradual process and should be given in small amounts without forcing the baby to drink it. Overhydration is rare but possible if water is given excessively or formula is diluted improperly. In summary:
- No water before 6 months.
- Start small amounts of water around 6 months with solids.
- Continue breast milk/formula as primary nutrition until 12 months.
- Ensure safe water (boiled if needed).
- Use cups like sippy cups to introduce drinking skills.
This guidance is supported by pediatric recommendations and health organizations.
