The primary risk is heatstroke, which can be fatal for children left in vehicles. High internal car temperatures can lead to severe dehydration, organ failure, and death. Parents and caregivers are particularly at risk of unintentionally leaving children behind due to stress, sleep deprivation, or changes in routine. The issue is not limited to heatwaves; even moderate weather can create dangerous conditions inside vehicles. This risk underscores the importance of vigilance and preventive measures to avoid such tragedies.