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Heat Illness in Kids: What Parents Need to Know Before It Happens

August 13, 2026

Heat exposure can put children at risk faster than many parents expect. Early symptoms often look like “just tired” or “just thirsty,” which means heat illness can escalate before anyone realizes something is wrong.


This article is sponsored by ChristianaCare.


CHOP at ChristianaCare encourages families to stay alert to these early signs, because acting quickly can prevent a serious emergency. Here’s what every parent needs to know.

Kids Overheat Faster — Especially in Delaware’s Humidity

Children warm up quickly, cool down slowly and sweat less efficiently than adults. Throw in high humidity that makes sweat evaporate poorly, and even a warm day can become risky during sports, camps or outdoor play. Kids also tend to push through early warning signs because they’re focused on the game or activity.

The key: Don’t wait for your child to say something feels wrong.

Warning Signs Parents Should Know

Move your child to shade or air conditioning immediately if you notice:

  • Excessive thirst
  • Unusual tiredness or weakness
  • Headache
  • Dizziness
  • Irritability

If these early signs go unnoticed, symptoms can progress quickly:

  • Heavy sweating
  • Pale or clammy skin
  • Muscle cramps
  • Nausea or vomiting
  • Fainting
  • Rapid breathing or heartbeat

Save this list on your phone. In a stressful moment, it’s easy to forget what to look for.

Heat Exhaustion vs. Heat Stroke

Heat exhaustion

A child may be sweaty, weak, dizzy or nauseated. Act immediately: stop activity, move to shade or AC, remove extra clothing, apply cool cloths and offer small sips of water. Seek medical care if symptoms worsen or don’t improve quickly.

Heat stroke

Heat stroke is life threatening. A child’s temperature may rise above 104°F, and their body can no longer cool itself. Warning signs include confusion, difficulty walking, fainting, seizures, very hot skin or a rapid pulse.

Call 911 immediately. Begin cooling your child while help is on the way.

Simple Ways to Prevent Heat Illness

  • Encourage hydration before going outside
  • Schedule water and shade breaks every 20–30 minutes
  • Choose morning or evening activities
  • Dress kids in lightweight, breathable clothing
  • Watch the heat index
  • Never leave a child in a parked car

When Your Child Needs Emergency Care

Heat illness can escalate quickly, even for attentive parents. If your child becomes confused, faints, has a seizure or shows signs of heat stroke, call 911.

CHOP at ChristianaCare provides 24/7 pediatric emergency care in Newark, staffed by CHOP pediatric emergency medicine specialists who understand how heat affects children’s bodies and how fast complications can develop.

Make CHOP at ChristianaCare your first stop for pediatric emergency care when heat-related symptoms become serious. Visit ChristianaCare.org/CHOP to learn how Children’s Hospital of Philadelphia and ChristianaCare are caring for kids—right here at home.