Febrile seizures are most prone to often occur within 24 hours of the inception of fever and mostly pop up as the first sign that the child is sick. These are broadly categorized as simple or complex. Explained both in detail by Pediatric Urgent Care Near Me:

•Simple febrile seizures: these are common type which stay for a couple to seconds to 15 minutes and are less probable to reoccur within 24-hour period. These are generalized and do not remain specific to any particular body part.
•Complex febrile seizures. These usually last longer than 15 minutes, are prone to occuragain within 24 hours. These are confined to a particular body part.

Pediatric Urgent Care Watchung explains some of the common signs and symptoms of Febrile Seizure which however vary as per the body type. In mild cases, the eyes may roll or limbs are prone to become stiff. In some instances, children fail to respond and lose consciousness.

•Difficulty in breathing such as apnea when the kid’s face turn bluish in color
•Vomiting
•Contraction of limbs, facial, and trunk muscles
•High Fever usually more 102°F
•Infection and severe illness for instance infection in upper respiratory
•Shaking
•Instinctive crying, moaning, or passing of urine
•Twitching

As a common sign, once the seizure passes after few minutes or seconds, the body muscles tend to relax, ended by a rhythmic jerking. Post experiencing the seizure, child might feel forgetful, sleepy or confused.