Summer brings so many wonderful moments with young children —family walks, beach days, park outings, BBQs, and vacations filled with sunshine and fresh air. But warmer temperatures and busy schedules also bring an important parenting concern: hydration.

A common question pediatricians hear during the summer is:

“How do I know if my baby is getting enough fluids?”

The good news is that most babies and toddlers do very well in the hot summer months with a few simple adjustments and a little extra awareness.

Understanding the signs of dehydration and how hot weather changes hydration needs can help you feel more confident and reassured in caring for your child all summer long.

Why hot weather can make hydration more important for babies and toddlers

Since their bodies are smaller and they cannot regulate temperature as efficiently, babies and toddlers can become dehydrated more easily than older children and adults. And between pool time, travel, and back-to-back outdoor activities, children may drink less than usual without realizing it. Hot weather can also increase fluid loss through sweating, even when children are not very active.

All this means is that caregivers should aim to stay aware of their child’s hydration throughout the day and make it as easy and accessible as possible to get enough fluids.

How much water does a baby need during the summer?

Hydration looks different depending on your child’s age.

Do babies under 6 months need water when it's hot outside?

For babies under 6 months old, breastmilk or formula will provide all the hydration they need—even during hot weather.

Since too much water at this age can interfere with nutrition and electrolyte balance, infants under 6 months of age should not receive water unless specifically directed by their pediatrician. In fact, the American Academy of Pediatrics (AAP) advises that babies under 6 months do not need additional water beyond breastmilk or formula.

How to keep babies hydrated before water is recommended

Instead, the best way to support hydration is often to offer breastmilk or formula more frequently.

This may look like:

• Shorter but more frequent nursing sessions

• Extra bottles during the day

• Additional feeds during travel or outdoor activities

• Monitoring cues as babies naturally “snack feed” more often in the heat

How much water should babies 6–12 months drink?

Around 6 months, once solids are introduced, small amounts of water can also be offered alongside meals.

The AAP advises that babies around this age generally need only about 4–8 ounces of water daily, since breastmilk or formula remains their primary source of hydration. Think of water at this age as a complement, not a replacement. A few sips with meals or during outdoor play is plenty for most infants.

How much water do toddlers need each day?

Toddlers become much more active during the summertime, which means hydration suddenly becomes both more important and more challenging. Some toddlers are too busy playing to stop and drink, while others become picky about water altogether.

Simple ways to encourage toddlers to drink more fluids

At this age, it often helps to:

• Offer fluids proactively

• Keep water bottles visible and accessible

• Build hydration into transitions (after outside play, before naps)

• Offer hydrating foods throughout the day

How can you tell if your baby is getting enough fluids?

One of the biggest ways to reduce anxiety about hydration is to learn which signs actually matter. Recognizing the early signs of dehydration is key to preventing dehydration issues. It helps parents feel more confident in managing hydration at home.

Signs your baby or toddler may need more fluids

Common signs of dehydration include:

• Fewer wet diapers

• Darker urine

• Dry lips or dry mouth

• Crying with fewer tears

• Increased fussiness

• Fatigue or unusual sleepiness

• Sunken eyes

• A sunken soft spot in infants

• Cool or mottled hands and feet in more severe cases

When dehydration may need medical attention

If your child is difficult to wake, not urinating, refusing fluids completely, or appears lethargic, they should be evaluated by a physician promptly.

Is it normal for babies and toddlers to eat less during hot weather?

Many parents notice their child eats less during the summer months. This is extremely common. Heat naturally suppresses appetite for many adults and children.

Why heat can affect appetite

During hot days, you may notice that babies and toddlers:

• Prefer smaller and lighter meals

• Snack more frequently

• Want cold foods

• Drink more and eat less

What eating and drinking changes are normal

Instead of focusing on large meals, think about offering lighter meals and regular hydration throughout the day.

Some children naturally compensate by eating better in the cooler evening hours after resting and rehydrating.

The best hydrating foods for babies and toddlers in summer

Hydration does not only come from cups and bottles.

Many fruits and foods contain significant amounts of water and can support hydration naturally during hot weather.

Foods with high water content for babies and toddlers

Some great summer options include:

• Watermelon

• Strawberries

• Cucumbers

• Peaches

• Nectarines

• Pears

• Oranges

• Yogurt

• Smoothies

• Applesauce

• Popsicles made from blended fruit and yogurt

Easy hydrating snack ideas for warm days

For babies eating solids, foods like watermelon, cucumber, yogurt, and fruit purees can be excellent warm-weather choices depending on developmental readiness.

For toddlers, smoothie popsicles or chilled fruit trays can sometimes work better than repeatedly asking them to drink water.

This is also a season where flexibility matters. Some days your toddler may survive almost entirely on watermelon, yogurt, and crackers after a beach day—and that is okay.

How to keep babies and toddlers hydrated while traveling

Between airports, car rides, and schedule disruptions, many children drink less than usual due to travel and being out of their routines.

Simple hydration tips for road trips, flights, and vacations

A few simple strategies can make a big difference:

• Offer fluids proactively

• Keep water accessible

• Take hydration breaks during travel

• Breastfeed or bottle-feed infants more frequently

• Bring familiar cups from home

• Offer hydrating foods and fruit during mealtimes and snacks

Beach days, splash pads, and outdoor play: keeping kids hydrated in the heat

Beach and pool days are common times when children can become dehydrated. The combination of heat, sun exposure, sweating, and outdoor activities can quickly increase fluid needs. Children also tend to become busy and distracted with play, which may lead them to ignore thirst cues.

Simple ways to offer fluids during outdoor play

A few practical tips to avoid dehydration:

• Offer fluids frequently during active play

• Use water play and indoor breaks to help cool body temperature

• Dress babies in breathable clothing

• Bring more fluids than you think you will need

Signs a child may be getting too hot

Heat exhaustion can have different symptoms in children. These include:

• Excessive crankiness or fatigue

• Dizziness

• Headache

• Nausea

When overheating becomes a concern

If your child suddenly seems “off,” especially after an extended period of outdoor activity, cooling down and rehydrating should be the first step.

If your child continues to seem off despite rehydration, they should be evaluated by a physician promptly.

Do babies and toddlers need electrolyte drinks?

Most healthy children playing casually outside do not need sports drinks.

For babies and toddlers, water, breastmilk, formula, and regular foods are usually enough.

When electrolyte solutions may be helpful

Electrolyte solutions may be helpful if a child is sick with vomiting or diarrhea, or if dehydration is severe. However, routine sports drinks are often unnecessary and may contain a lot of added sugar.

If you are unsure whether your child needs something beyond water or milk, check with your pediatrician.

Simple summer hydration tips that work in real life

Sometimes the simplest routines work best.

Everyday habits that support hydration

A few realistic ways to support hydration:

• Offer fluids often, not just at meals

• Pair outdoor play with water breaks

• Keep water bottles visible

• Offer hydrating snacks throughout the day

• Anticipate appetite changes in the heat

• Prioritize shade and cooling breaks

• Follow your child’s cues while staying proactive

Flexible approaches for busy summer days

Sometimes hydration looks like carefully planned water breaks.

Other times it looks like watermelon after the splash pad and an extra cup of milk before bed.

Both can support hydration.

A reassuring note about water, hydration, and summer feeding

Summer parenting can sometimes feel like a balancing act - between keeping children safe and still letting everyone enjoy the season.

The good news is that most babies and toddlers stay well hydrated with simple preventive habits.

You do not need to monitor every ounce your child drinks. Instead, focus on overall behavior, wet diapers, energy levels, and making hydration part of your summer rhythm.

Some days your child may have perfectly balanced meals and timed water bottles, while other days they may skip lunch and survive mostly on watermelon after the splash pad.

And on both these days, your child is perfectly okay.

 

Written by Dr. Irini Kolaitis, MD

Pediatrician & Advisor at Bébé Foodie

Dr. Irini Kolaitis is a board-certified pediatric hospitalist in Chicago, with dual certification in General Pediatrics and Pediatric Hospital Medicine. With clinical expertise in food-related issues like anaphylaxis, feeding challenges, and nutritional deficiencies, she brings both professional and personal insight to Bébé Foodie. As a new mom, Dr. Kolaitis understands the ups and downs of introducing solids and supports our mission to make nutrition guidance simple and pressure-free for families.

This blog post is for information purposes only and shouldn’t be used as personal, health, nutritional, or medical advice. Always consult with your pediatrician before making any decisions about your child's health or readiness for various foods.