When Can Babies Have Water?
It seems like such a simple question, but when it comes to babies and water, timing matters more than you might think. Here's everything you need to know.
Quick Answer
- 0-6 months: No water needed (breast milk/formula only)
- 6+ months: Small sips with meals (2-4 oz/day)
- 12+ months: Water freely throughout the day
Why No Water Before 6 Months?
The American Academy of Pediatrics (AAP) recommends no water before 6 months. Here's why:
1. Breast Milk and Formula Are Complete Nutrition
Breast milk is about 88% water. Formula is also mostly water when prepared correctly. Your baby gets all the hydration they need from these sources—even in hot weather.
2. Risk of Water Intoxication
Babies' kidneys are immature and can't process excess water efficiently. Too much water can dilute sodium levels in the blood, causing a dangerous condition called hyponatremia (water intoxication).
Symptoms of water intoxication:
- Irritability or drowsiness
- Low body temperature
- Facial puffiness
- Seizures (in severe cases)
Never dilute formula with extra water to make it last longer. Always follow package instructions exactly.
3. Fills Up Tiny Tummies
Newborn stomachs are tiny (about the size of a cherry at birth). Water takes up precious space that should be filled with nutrient-rich milk, potentially leading to poor weight gain.
4. Can Interfere with Breastfeeding
Giving water to a breastfed baby can reduce their demand for breast milk, which can affect milk supply and lead to early weaning.
When to Start Giving Water
6 Months: Introduction Time
Once your baby starts eating solid foods (around 6 months), you can begin offering small amounts of water. At this stage, water serves several purposes:
- Helps with digestion of solid foods
- Introduces the concept of drinking from a cup
- Prevents constipation from starting solids
- Teaches a healthy hydration habit
How Much Water at Different Ages
| Age | Water Amount | Notes |
|---|---|---|
| 0-6 months | None | Breast milk/formula only |
| 6-8 months | 2-4 oz (60-120ml)/day | Small sips with meals |
| 9-12 months | 4-8 oz (120-240ml)/day | With meals and snacks |
| 12-24 months | 8-32 oz (240-950ml)/day | Main beverage alongside milk |
Pro tip: At 6 months, offer water in an open cup or straw cup rather than a bottle. This helps develop oral motor skills.
What Kind of Water is Best?
Safe Water Options
- Tap water (if safe in your area)
- Filtered water
- Bottled water (labeled for infants, low sodium)
Water Safety Tips
- Check if your tap water contains fluoride (good for teeth after 6 months)
- If using well water, have it tested for contaminants
- Avoid mineral water or sparkling water for babies
- No need to boil water for healthy babies 6+ months (in developed countries)
Do I Need to Boil Water?
For babies under 6 months, if you're preparing formula, use water that has been boiled and cooled (especially if using well water or in areas with questionable water quality).
For babies 6 months and older, tap water is generally safe in most developed countries without boiling.
Common Questions
Can I give water if my baby is constipated?
Under 6 months: No. Instead, try bicycle legs, tummy massage, or consult your pediatrician. For formula-fed babies, ask about changing formulas.
6+ months: Yes, a few extra ounces of water with meals can help. Also increase fiber-rich foods like prunes, pears, and peas.
What about on really hot days?
Under 6 months: Offer more frequent breast milk or formula feeds. No water needed—milk keeps them hydrated.
6+ months: Offer extra water between feeds. Watch for signs of dehydration (fewer wet diapers, dark urine, lethargy).
Can I give juice instead of water?
The AAP recommends no juice before 12 months. Juice has sugar and no nutritional benefit over whole fruit. After 12 months, limit to 4 oz/day of 100% juice.
Water is always the better choice.
What about gripe water for colic?
"Gripe water" is not the same as regular water. While some parents find it helpful for fussiness, there's limited scientific evidence for its effectiveness. If you choose to use it, check with your pediatrician first and follow dosage instructions.
Signs Your Baby is Getting Enough Fluids
- 6+ wet diapers per day
- Urine is pale yellow or clear
- Soft, moist lips and mouth
- Tears when crying
- Alert and active
- Steady weight gain
Signs of Dehydration
Contact your pediatrician if you notice:
- Fewer than 4 wet diapers in 24 hours
- Dark yellow or orange urine
- Dry mouth or cracked lips
- No tears when crying
- Sunken soft spot (fontanelle)
- Unusual drowsiness or fussiness
- Sunken eyes
Teaching Baby to Drink Water
At 6 months, most babies don't know how to drink from a cup yet. Here's how to help:
- Start with an open cup and hold it for them
- Try a straw cup—some babies find these easier
- Offer at mealtimes when they're in the high chair
- Model the behavior—drink water in front of them
- Be patient—most water will end up on their bib at first
- Skip the sippy cup if possible (can affect dental development)
The Bottom Line
Wait until 6 months to introduce water, then offer small amounts with meals. Before 6 months, breast milk and formula provide complete nutrition and hydration—even in hot weather.
When you do start water, think of it as practice rather than nutrition. Milk should remain the primary beverage until 12 months, when water and milk become equally important.