Health Canada’s guide “Keep children cool! Protect your child from extreme heat” (2024) offers essential recommendations to safeguard infants and young children during heat waves. It identifies high-risk groups—including babies, children with asthma, heart or kidney conditions, developmental disorders, or those taking specific medications—and outlines proactive preparation steps such as monitoring forecasts via WeatherCAN, testing air conditioners, and identifying cool spaces. The guide advises caregivers to watch for serious heat illness symptoms like dizziness, vomiting, rapid heartbeat, extreme thirst, dark urine, behavioral changes, and fainting. Hydration is emphasized through fun drinking routines, fruit consumption, and breastmilk for infants. Homes should be kept cool by using air conditioning or, failing that, blocking sunlight and ventilating at night. Caregivers are urged to limit outdoor activities to cooler times and never leave children in parked cars. In emergencies—such as heat stroke—immediate action includes cooling the child and calling 911. This guidance enhances protection for Canada’s most vulnerable in a warming climate.