If your toddler has a seizure during a fever, it's frightening—but research suggests it's usually not as serious as it feels. Febrile seizures (which happen in children ages 6 months to 5 years) typically cause no lasting harm to brain development, learning, or behavior. Most children grow out of them naturally. Regardless, seek medical care right away. Studies indicate that while some medications can prevent future seizures, they come with side effects in up to 30% of children. Most experts recommend focusing on keeping your child comfortable during fevers rather than using daily medications to prevent seizures. Always talk with your pediatrician about your specific situation and what makes sense for your family.