When Can Babies Start Drinking Water? A Month-by-Month Guide

As a new parent, you're constantly navigating a flood of advice on what's best for your baby—and hydration is no exception. One of the most common questions parents ask is: When can babies start drinking water? The answer isn't as simple as it seems, and it often leads to confusion, especially when well-meaning relatives or cultural traditions suggest offering water early on, particularly in hotter climates.

However, giving water to a baby too soon can actually do more harm than good. Newborns have tiny kidneys that aren’t yet developed enough to process extra water safely. Too much water can interfere with their body's ability to absorb nutrients, potentially leading to a serious condition called water intoxication.

Understanding your baby’s developmental readiness is key. Babies get all the hydration they need from breast milk or formula during their first months. But as they grow and begin to eat solids, the need for water gradually increases.

In this month-by-month guide, we’ll walk you through the safe timeline for introducing water to your baby, explain how much is appropriate at each stage, and offer practical tips—especially for parents in warm climates like Islamabad—so you can feel confident in keeping your little one healthy and hydrated.

Water for Babies A Month-by-Month Breakdown

From birth to 6 months, babies should not be given water unless advised by a pediatrician. During the 0–3 month stage, their bodies are perfectly hydrated through breast milk or infant formula, both of which provide the necessary fluids and nutrients. Giving water at this age can overwhelm their immature kidneys and dilute essential electrolytes. Instead, parents should watch for signs of dehydration—such as fewer wet diapers, dry mouth, or excessive sleepiness—and contact their pediatrician immediately if they suspect an issue.

As babies reach 4–5 months, some parents may wonder if it's okay to offer water, especially in hot climates. While it’s natural to be concerned about hydration in warmer environments, breast milk or formula still provides adequate fluids. In rare cases, pediatricians might recommend minimal water intake, but this should only be under medical supervision. The focus should remain on milk or formula as the baby’s primary source of hydration.

Once a baby hits the 6-month milestone and starts eating solid foods, it's safe to introduce small sips of water—around 1–2 ounces per day. At this stage, offering a few sips in a cup during mealtime helps support hydration and gets babies used to drinking from something other than a bottle. Distilled water is a safe choice because it’s free of contaminants and minerals that infants' bodies may not handle well.

Between 7–9 months, as solid food intake increases, water can be gradually bumped up to 4–6 ounces per day. Using a sippy cup encourages motor skill development and builds good drinking habits. Look for signs like regular wet diapers and good energy levels to ensure your baby is adjusting well to the new routine.

By 10–12 months, water can become a regular part of your baby's daily diet, though it should still be paired with formula or breast milk. Continue to prioritize safe water sources—distilled water remains a trusted option during this transitional period to toddlerhood.

Safe Water Tips for Babies

When it comes to mixing formula or offering sips of water to your baby, not all water is created equal. Distilled water is often the preferred choice for infants because it’s been purified through boiling and condensation, removing nearly all minerals, bacteria, and contaminants. This makes it gentler on a baby’s developing kidneys and safer for daily use, especially during the first year when their bodies are still growing and adapting. Properly filtered water is another option, but parents should ensure the filtration system removes harmful substances without leaving behind trace chemicals.

For infants under 12 months, it’s best to avoid regular tap water, especially in areas where it contains added fluoride or chlorine. While fluoride can help prevent tooth decay in older children, too much of it at an early age can lead to a condition called dental fluorosis, which affects the appearance of developing teeth. Chlorine, used to disinfect water, may also irritate sensitive infant digestive systems. When in doubt, always choose distilled or pediatric-recommended bottled water.

Safe water doesn’t stop at source—it extends to storage and hygiene. Always store distilled water in a clean, sealed container and avoid touching the inside of the bottle cap or pouring spout with your hands. If you're transferring water to smaller containers, ensure they’re sterilized and kept in a cool, dry place. For formula preparation, use freshly poured water for each bottle to prevent bacterial growth, and never reuse water that’s been sitting out. With the right precautions, you can keep your baby’s hydration safe, clean, and worry-free.

Signs of Dehydration and When to Call Your Pediatrician

Recognizing dehydration in babies early is crucial, as their smaller bodies can lose fluids quickly. Some of the most common signs include a dry mouth or lips, fewer than six wet diapers per day, dark yellow urine, and a sunken soft spot (fontanelle) on the top of the head. Other symptoms may include lethargy, irritability, or crying without tears. If you notice any combination of these symptoms, especially if your baby also has diarrhea, vomiting, or a fever, it’s important to contact your pediatrician right away.

In hot climates, babies are at greater risk of fluid loss through sweating and faster evaporation. To monitor hydration, keep track of diaper output, ensure your baby is feeding well, and look for signs of overheating like flushed skin or excessive fussiness. For babies under six months, breast milk or formula should remain their only source of hydration—even in the heat. Older babies who are eating solids can be offered small sips of distilled water during the day. Always seek medical advice if you're unsure whether your baby is getting enough fluids.

Frequently Asked Questions

Can I give water to a sick baby?

It depends on your baby’s age and the nature of their illness. For infants under 6 months, stick to breast milk or formula unless your pediatrician advises otherwise. These provide not only hydration but also essential nutrients and immune support. For babies over 6 months, small sips of distilled water can help, especially if they have a fever or mild diarrhea—but always consult your doctor first.

What about water in hot weather?

In hot climates, it’s natural to worry about dehydration. Babies under 6 months should still rely exclusively on breast milk or formula for hydration, even during heatwaves. For older babies, offering small amounts of distilled water alongside regular feeds and solids is appropriate. Keep your baby cool with lightweight clothing and shade rather than increasing fluid intake beyond age-appropriate guidelines.

Should I boil distilled water?

No, boiling distilled water is generally unnecessary. Distilled water has already undergone a purification process that removes bacteria, chemicals, and minerals. However, always ensure the bottle or container you’re using to store the water is sterile and sealed properly to avoid contamination.

Can babies drink electrolyte water?

Electrolyte solutions should only be given under medical supervision, typically when a baby is experiencing dehydration from vomiting or diarrhea. These products are not meant for routine hydration. For healthy babies, especially those under 12 months, plain breast milk, formula, and age-appropriate amounts of distilled water are the safest choices.

Conclusion

Understanding when and how to introduce water to your baby is a key part of supporting their growth and overall health. In the first few months (0–5 months), breast milk or formula provides all the hydration your baby needs. Around 6 months, as solid foods are introduced, small sips of water can safely be offered. By 12 months, water can become a regular part of their daily routine—always ensuring it's sourced from clean, safe options like distilled water.

As you navigate your baby’s hydration journey, keep in mind that every child is different. Always consult with your pediatrician before making changes to your baby's fluid intake, especially in cases of illness, heat, or specific health concerns.

Curious about which type of water is best as your baby transitions from formula to regular hydration? Be sure to read our guide on Tips for Introducing Purified Water to Your Baby to make informed, safe choices.

For more expert advice on infant hydration, formula preparation, and baby wellness, explore the Bay Bay Water blog or contact us directly with any questions or concerns. We’re here to support your parenting journey with trusted, baby-safe water solutions.