A Complete Guide for Parents to When Should Babies Start Drinking Water?
Many new parents wonder whether babies need water from an early age. Although it may seem simple, giving water to infants is not something to do randomly. According to the World Health Organization (WHO) and the Indonesian Pediatric Society (IDAI), exclusive breastfeeding is recommended for the first six months of life. During this period, babies should only consume breast milk or formula, without any additional fluids, including water.
Breast milk or formula already contains all the nutrients and hydration a baby needs. In fact, breast milk is over 80% water, which sufficiently meets a baby’s fluid requirements. Moreover, breast milk composition adapts to the baby’s needs—for example, the initial milk during a feed is more watery and rich in lactose to quench the baby’s thirst.
Why Babies Should Not Be Given Water Too Early
According to the American Academy of Pediatrics (AAP) and IDAI, babies aged 0–6 months do not need additional water. Giving water too early can pose several serious risks:
Interferes with nutrition intake: Breast milk or formula already provides enough hydration and essential nutrients. Extra water can fill the stomach, making the baby less likely to feed and reducing nutrient intake.
Risk of water intoxication: Excessive water can disturb the baby’s electrolyte balance, especially sodium. Babies’ kidneys are not fully developed and cannot handle large amounts of water. Overhydration can dilute blood sodium levels, potentially causing seizures, coma, or even death.
Increased risk of infection: Water may not always be sterile, which can introduce bacteria or pathogens that may cause diarrhea or other illnesses.
When Can Babies Start Drinking Water?
According to WHO and IDAI guidelines, water can be introduced:
After 6 months of age, when starting complementary foods (MPASI).
Give small amounts (a few sips or spoonfuls) to help the baby learn to drink from a cup or bottle while preventing constipation.
Do not overdo it—the main source of fluids should remain breast milk, formula, or water-rich foods like fruits.
The Right Time to Give Water
Introduce water when the baby reaches 6 months old and begins complementary feeding. Water helps with:
Digestion: Thicker complementary foods may need a small amount of water to aid digestion and prevent constipation.
Drinking habits: This is the ideal time to teach the baby to drink from a baby cup, spoon, or sippy cup.
Even after starting complementary foods, water should not replace breast milk or formula as the primary source of nutrition.
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Signs a Baby May Need Extra Fluids
While breast milk or formula is usually sufficient, there are special situations where additional fluids may be needed under medical supervision:
High fever
Persistent diarrhea or vomiting
Certain medical conditions as advised by a doctor
In such cases, the fluid may not be plain water but oral rehydration solutions or medically recommended fluids.
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Safe Tips for Giving Water to Babies
For babies over 6 months:
Use clean, boiled water
Offer water in a small cup or with a straw, not in a baby bottle, to encourage proper drinking habits
Do not replace milk or main meals with water
Limit the amount according to the baby’s needs
Babies 0–6 months do not need water, as breast milk or formula already fulfills all their fluid requirements. Introducing water too early can pose health risks. After 6 months, water can be gradually introduced in small amounts alongside complementary foods. Always consult a pediatrician if you have questions or concerns about your baby’s nutrition and hydration. Patience and accurate information are key to ensuring optimal growth and development.
