Can excessive heat can cause seizures?

Very unlikely. Seizures can be triggered by specific stimuli such as flickering light or hyperventilation. Fever in a toddler is associated with a toxic state that can cause a seizure. Heat alone is very unlikely to cause a seizure. Being aware of early signs of a seizure is very important. Avoiding stimuli that can bring on a seizure is important. These must be part of seizure management.