Keeping your baby hydrated in summer
Last updated July 2026 · Reviewed by Nibli Editorial Team
A clear, parent-friendly guide to keeping your 6 to 12 month old comfortable and hydrated when the weather heats up.
When temperatures climb, it is natural to worry about whether your baby is getting enough to drink. The good news is that keeping a baby hydrated in summer is usually simpler than parents expect. For babies under 12 months, breast milk or formula continues to do most of the work, and small amounts of water plus water-rich foods can help fill the gaps once solids are underway.
This guide walks you through what actually matters in hot weather: why milk stays the main drink, when and how much water is appropriate, which foods add extra fluids, and how to spot the early signs of dehydration and overheating. It follows standard pediatric guidance so you can feel confident rather than second-guessing every warm afternoon.
You will also learn what to skip, including juice and too much plain water before six months, both of which can do more harm than good. Every baby is different, so treat this as a friendly starting point and check with your pediatrician or health visitor if you have specific concerns about your little one.
Key takeaways
- Breast milk or formula stays the main drink for the whole first year, even in hot weather.
- Babies under six months do not need extra water; offer more milk instead.
- From six months, a few sips of water at meals in an open cup are fine.
- Water-rich foods like watermelon, melon, and cucumber gently boost hydration.
- Never dilute formula or give juice, squash, or sugary drinks in the first year.
- Learn the signs of dehydration: fewer wet diapers, dry mouth, and unusual sleepiness.
- Keep your baby cool and shaded, and offer feeds more often when it is hot.
Does a baby actually need water in summer?
For babies under six months, the answer is almost always no. Breast milk and formula are mostly water and provide all the hydration a young baby needs, even on hot days. Giving extra plain water to a baby this young can fill their small tummy, reduce milk intake, and in some cases upset the balance of minerals in their body.
Once your baby is around six months and eating solids, small sips of water alongside meals are fine and can be helpful in the heat. But water is a bonus, not a replacement. Milk should still be the drink you reach for most often when your baby seems thirsty or fussy in warm weather.
If it is very hot and your baby seems extra thirsty, the simplest response for a breastfed baby is to offer the breast more often. Formula-fed babies can have their usual feeds a little more frequently rather than needing large amounts of water.
Milk stays the main drink under 12 months
This is the single most important point for summer hydration. Whether your baby is breastfed, formula-fed, or a mix of both, milk remains the primary source of fluids and nutrition for the entire first year. Hot weather does not change that.
Rather than reaching for water first, offer milk more often on warm days. Breastfed babies may want to nurse in shorter, more frequent sessions, and that is completely normal. There is no need to add water to formula or to dilute it, as the mixing instructions on the tin are designed to keep your baby properly hydrated.
- Breastfed babies: nurse on demand and offer the breast more often in the heat.
- Formula-fed babies: keep to the standard mixing ratio and offer usual feeds more frequently if needed.
- Never dilute formula with extra water to make it go further or to add fluids.
- Cooled boiled water (for formula-fed babies under six months) should only be given in tiny amounts and after a chat with your health provider.
When and how much water to offer
From around six months, when your baby starts solids, you can begin offering small amounts of water in an open cup or a free-flow (non-valved) cup with meals. This helps with digestion, gets your baby used to drinking from a cup, and adds a little extra fluid in summer.
There is no need to push a target amount. A few sips at mealtimes is plenty at first. As your baby grows and eats more solid food, they will naturally take a bit more water. Let their thirst and interest guide you rather than aiming for a set number of ounces.
- Offer water in an open cup or free-flow cup, not a bottle, to protect developing teeth.
- Start with just a few sips at meals; there is no daily quota to hit.
- Use plain, cooled boiled water for babies under six months if ever needed; from six months, fresh tap water is fine in most areas.
- Increase water gradually as solids increase over the second half of the first year.
Water-rich foods that help with hydration
Once your baby is eating solids, some fruits and vegetables can quietly boost fluid intake because they are made mostly of water. These make a refreshing addition to summer meals and are a gentle, food-based way to top up hydration without relying on drinks alone.
Always serve these in choking-safe shapes for your baby's stage. Soft foods can still be a hazard if they are round, firm, or in large pieces, so cut and prepare them thoughtfully.
- Watermelon: remove seeds and serve in soft, thin strips or small mashed pieces.
- Cucumber: peel and serve as soft cooked sticks or grated for younger eaters; large raw batons can be a choking risk.
- Melon (cantaloupe or honeydew): ripe, soft, and cut into age-appropriate strips or pieces.
- Peach: ripe and soft, skin removed, sliced into manageable pieces.
- Berries such as strawberries and blueberries: quartered or smashed to remove the round choking shape.
- Steamed or cooked vegetables like courgette (zucchini) also carry plenty of water.
Signs your baby may be dehydrated
Knowing the early signs of dehydration helps you act quickly on hot days or during illness. Mild dehydration can often be managed at home by offering milk more frequently, but more serious signs need prompt medical attention.
Trust your instincts. If your baby seems unwell, unusually sleepy, or hard to rouse, do not wait; contact your pediatrician, health provider, or emergency services right away.
- Fewer wet diapers than usual, or noticeably darker, stronger-smelling urine.
- A dry mouth, dry lips, or crying with few or no tears.
- A sunken soft spot (fontanelle) on the top of the head.
- Unusual sleepiness, floppiness, or being difficult to wake.
- Fast breathing, cold or blotchy hands and feet, or a generally unwell appearance.
Spotting and preventing overheating
Hydration and temperature go hand in hand in summer. Babies cannot regulate their body heat as well as adults, so a big part of keeping them hydrated is simply keeping them cool and out of direct heat.
Watch for signs of overheating such as flushed or clammy skin, rapid breathing, or a baby who feels hot on the chest and back. Feeling the back of the neck or the chest is a better guide to temperature than hands and feet, which can feel cool even when a baby is warm.
- Keep babies out of direct sun, especially between late morning and mid-afternoon.
- Dress your baby in light, loose, breathable clothing and remove layers indoors.
- Use shade, a stroller cover with airflow, and cool rooms with fans positioned away from the baby.
- Offer milk more frequently, as extra feeds help with both hydration and comfort.
- Babies under six months should be kept out of direct sunlight altogether.
What NOT to give your baby
Some drinks and habits can undermine your baby's hydration and health, even when your intentions are good. Steering clear of these keeps summer feeding safe and simple.
In particular, fruit juice offers no benefit for babies and can crowd out milk and expose developing teeth to sugar. Plain water in any real quantity before six months can also be genuinely risky, so it is best avoided unless a health professional advises otherwise.
- No fruit juice, squash, cordial, or sugary or flavored drinks in the first year.
- No large amounts of plain water before six months; milk provides all needed fluids.
- No added sugar, salt, or honey in foods or drinks before your baby turns one.
- No diluting or watering down formula to stretch it or add fluids.
- Avoid ice-cold drinks or hard ice cubes; offer cool, not freezing, options instead.
Simple summer hydration routine
Putting it all together, a good hot-weather routine keeps milk at the center, adds small sips of water once solids begin, and leans on water-rich foods for a refreshing boost. Keep your baby cool, watch for the signs above, and offer feeds a little more often than usual.
You do not need special products or complicated schedules. Consistency, shade, and responsive feeding will carry most babies comfortably through the summer months.
- Offer milk on demand and more frequently on hot days.
- From six months, include a few sips of water at meals in an open cup.
- Serve hydrating fruits and veggies in choking-safe shapes.
- Keep your baby cool, shaded, and lightly dressed.
- Check diapers and mood, and call your provider if you see dehydration signs.
Frequently Asked Questions
Does my baby need water in summer?
Under six months, no. Breast milk or formula provides all the hydration your baby needs, even on hot days. From around six months, small sips of water with meals are fine, but milk should still be the main drink you offer when your baby is thirsty.
How much water can I give my baby in hot weather?
From six months, a few sips at each meal is plenty to start. There is no daily amount you need to hit; let your baby's thirst guide you. Water is an extra, not a substitute for milk, so keep offering milk feeds as usual.
Can I give a newborn water when it is hot?
It is best not to give a newborn plain water. In young babies, extra water can fill their small stomach, reduce milk intake, and upset the balance of minerals in their body. If it is hot, offer breast milk or formula more often instead.
Should I offer more milk when it is hot outside?
Yes. On warm days, breastfed babies may want to nurse more often and in shorter sessions, and formula-fed babies can have their usual feeds a bit more frequently. Extra milk is the safest way to keep a baby under one well hydrated in the heat.
What foods help keep my baby hydrated?
Once your baby eats solids, water-rich foods like watermelon, melon, cucumber, and ripe peach add extra fluid. Serve them in soft, choking-safe shapes for your baby's stage. These make a refreshing summer addition alongside regular milk feeds.
Can I give my baby fruit juice to keep them hydrated?
No. Fruit juice offers no real benefit for babies under one, can reduce milk intake, and exposes developing teeth to sugar. For hydration, stick to milk, small sips of water from six months, and water-rich foods.
How do I know if my baby is dehydrated?
Watch for fewer wet diapers, darker urine, a dry mouth, crying with few tears, a sunken soft spot, or unusual sleepiness. Mild signs can often be helped by offering milk more often. If your baby seems very unwell or hard to wake, seek medical help right away.
Should I use a bottle or a cup for water?
An open cup or a free-flow (non-valved) cup is best for water from around six months, as it helps protect developing teeth and builds cup-drinking skills. Save the bottle for milk feeds if you use one. A few sips at mealtimes is a great place to start.
Is it safe to give my baby cold or iced drinks in summer?
Cool drinks are fine, but skip very icy drinks and hard ice cubes, which can be uncomfortable or a choking risk. Offer cool water or milk rather than freezing options. Homemade, age-appropriate frozen treats made from milk or soft fruit can be a gentler way to cool down.
How can I stop my baby from overheating?
Keep your baby out of direct sun, dress them in light, loose clothing, and use shade and cool, airy rooms. Feel the back of the neck or chest to check their temperature rather than hands and feet. Offering milk more often also helps with both cooling and hydration.
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