Every coach and parent has seen it: a kid who’s flushed, cranky, and suddenly “too tired” to finish a drill, when the real problem is that they haven’t had enough to drink. Dehydration can start affecting a young athlete’s performance and safety in under an hour of activity, and by the time a child feels thirsty, they’re often already behind on fluids.
This guide breaks down exactly how much water kids need before, during, and after practices and games, based on guidance from the American Academy of Pediatrics (AAP) and pediatric sports medicine sources, plus how to spot dehydration early and when a sports drink actually makes sense.
Quick Answer
Kids under 90 pounds should get about 5 ounces of fluid (roughly 10 gulps) every 15 to 20 minutes during play; kids over 90 pounds need about 10 ounces (20 gulps) on the same schedule. Add 12–18 ounces before activity starts and 16–24 ounces for every pound of body weight lost by the end. Plain water covers most practices — save sports drinks for games longer than an hour or intense heat.
How Much Water Kids Need Before, During, and After Play
Before activity: Have kids drink about 12 to 18 ounces (roughly 1.5 to 2 cups) in the hour or two before practice or a game. This gives the body time to absorb fluid instead of sloshing around during warmups.
During activity: This is where body size matters most. For athletes under 90 pounds, aim for about 5 ounces of fluid — about 10 gulps — every 15 to 20 minutes. For athletes over 90 pounds, double that to roughly 10 ounces (20 gulps) on the same 15-to-20-minute schedule. Framed by age instead of weight, 9-to-12-year-olds generally need about 3 to 8 ounces every 20 minutes, while teens need considerably more — up to 34 to 50 ounces per hour during vigorous training.
After activity: Fluid losses vary a lot by kid, sport, and weather, so the most reliable check is weighing in before and after intense or long sessions. For every pound lost during play, have the athlete drink 16 to 24 ounces of fluid to fully rehydrate before the next practice.
Daily baseline: Outside of practice, a good rule of thumb for everyday hydration is about half an ounce to one ounce of water per pound of body weight, spread across the day — more on practice or game days.
Heat Rules, Dehydration Signs, and Water vs. Sports Drinks
Heat changes the math, but not for the reason many people assume. The American Academy of Pediatrics has reaffirmed that, when properly hydrated, kids do not have less effective cooling ability or lower heat tolerance than adults — the real risk factors are staying well-hydrated, avoiding overexertion, getting enough recovery time between drills or back-to-back games, and not wearing heavy, heat-trapping uniforms or equipment longer than necessary. The AAP’s Council on Sports Medicine still recommends building in 5- to 10-minute water breaks every 30 minutes once the heat index hits 82°F or higher, with kids resting in shade and removing helmets or heavy gear during breaks.
Don’t wait for thirst as a cue — thirst means a child is already dehydrated. Watch instead for early warning signs: flushed skin, complaints of headache or muscle cramps, fatigue that seems out of proportion to the activity, dizziness, or dark yellow urine. A rapid pulse, nausea, or confusion are signs to pull a child from play immediately and cool them down, since these can point toward heat exhaustion.
For most practices under an hour, plain water is the best choice for kids and teens — it’s what pediatricians recommend as the default. Sports drinks with electrolytes and carbohydrates are worth considering for games or tournaments lasting longer than about an hour, for double-headers, or for intense activity in high heat where sweat losses are heavy. Outside of those situations, sports drinks mostly just add sugar kids don’t need.
Tips and Common Mistakes
Don’t rely on kids to self-monitor. Younger athletes especially are bad at recognizing thirst and will play through early dehydration if no one prompts them. Build mandatory water breaks into the schedule instead of making them optional.
Skip the pre-game energy drink or soda. Caffeine and high sugar content can worsen dehydration and cause a mid-game energy crash — water or a diluted sports drink is a safer bet.
Send kids to practice already hydrated. A child who shows up thirsty on a hot afternoon is starting the session at a deficit that’s hard to make up once activity begins.
Check urine color as a simple gut check. Pale yellow generally signals good hydration; dark yellow or amber is a sign to increase fluids before the next session.
Label water bottles and keep them within reach. It sounds basic, but kids drink more when a bottle is sitting right next to them on the bench instead of packed away in a bag.
Watch recovery time and gear, not just fluids. Since overexertion, insufficient rest between sessions, and heavy uniforms or pads are now recognized as bigger heat-illness risk factors than any inherent difference in kids’ cooling ability, spacing out drills and limiting equipment time on hot days matters as much as the water bottle.
Explore more: More youth sports safety and training guides.
Youth sports hydration FAQs
How much water should a 10-year-old drink during a soccer game?
For a child around this age and under 90 pounds, aim for about 5 ounces (roughly 10 gulps) of water every 15 to 20 minutes during play, plus 12–18 ounces before kickoff and 16–24 ounces per pound lost afterward.
Is it bad if my child doesn’t feel thirsty during practice?
Yes — thirst isn’t a reliable early warning system for kids. By the time a child feels thirsty, they’re often already somewhat dehydrated, which is why scheduled water breaks matter more than waiting for a child to ask for a drink.
Do kids overheat faster than adults during sports?
Not inherently. The AAP has reaffirmed that when kids are adequately hydrated, they don’t have less effective thermoregulation than adults. The bigger risks are overexertion, too little recovery time between activity bouts, and heavy uniforms or equipment — all of which are manageable with scheduled breaks and smart gear choices.
Should young athletes drink sports drinks instead of water?
Water is the better default for most practices and games under an hour. Sports drinks with electrolytes can help during activity longer than an hour, tournaments with multiple games, or intense heat, but they add unnecessary sugar for shorter, cooler sessions.
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Photo by Johnny McClung on Unsplash.
