Why Babies Under 6 Months Shouldn’t Drink Water

Offering a thirsty baby a sip of water might seem like a kind and natural instinct. But for infants under six months old, plain water can actually be dangerous. Despite how vital hydration is for adults and older children, young babies get all the fluids they need from breast milk or formula and giving them water too soon can cause serious complications.

Here’s what every parent and caregiver should know about why babies shouldn’t drink water too early and when it’s safe to start.

Why Water Can Be Harmful for Young Babies

Newborns and young infants have tiny bodies with developing kidneys that are not yet equipped to process excess water. Giving water to a baby under six months can lead to a condition called water intoxication a rare but potentially life-threatening issue.

Water intoxication happens when too much water dilutes the sodium in a baby’s bloodstream. This imbalance can cause cells in the body (including those in the brain) to swell, which may lead to:

• Seizures

• Low body temperature

• Breathing difficulties

• Irritability or lethargy

• In severe cases, coma

How Babies Stay Hydrated Without Water

Breast milk and infant formula are designed to meet all of a baby’s nutritional and hydration needs for the first six months of life. In fact, breast milk is composed of about 87% water, which is more than enough to keep your baby hydrated even in hot weather or during illness.

Formula-fed babies also receive adequate fluids, as infant formula is mixed with water to the proper concentration. Pediatricians strongly advise against diluting formula with extra water, which can be just as harmful as offering plain water.

When Can Babies Safely Start Drinking Water?

According to the American Academy of Pediatrics (AAP), small amounts of water can be introduced after six months of age, once a baby begins eating solid foods. Even then, water should be given in moderation no more than 4 to 8 ounces per day until the baby turns one.

By age 1, when babies are eating a full range of solids and their kidneys are more developed, water can be given more freely.

Signs Your Baby Might Be Getting Enough Fluids

As long as your baby is feeding regularly and gaining weight as expected, they are likely well-hydrated. Some signs of adequate hydration include:

• Regular wet diapers (at least 6 per day after the first week of life)

• Pale yellow urine

• Moist lips and tongue

• Alertness and active periods

Avoiding Water in Unexpected Places

In addition to offering plain water, parents should also be cautious of:

• Diluted formula: Always mix formula according to package directions.

• Homemade baby foods or juices before 6 months: These can introduce extra water and strain the kidneys.

• Popsicles, broths, or water-based snacks: Wait until your pediatrician gives the go-ahead.

What About Hot Weather?

In hot climates or during heatwaves, many parents worry that babies might become dehydrated. But even then, experts agree that extra breast milk or formula not water is the safest way to keep your baby hydrated. Offer feedings more frequently if needed.

The Takeaway

While water is essential for life, babies under six months don’t need and shouldn’t have plain water. Their small bodies are not built to handle it, and even small amounts can lead to serious complications like water intoxication. After six months, small sips can be introduced, but breast milk or formula should remain the primary source of hydration until the first birthday.

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