We report that this exon incorporates ClinVar variant RCV000209951, an SCN1A de novo variant found in a patient that was initially described as DS,31 but after re-examination of the phenotype, appeared to have febrile seizures plus: he had his first febrile seizure at the age of 23 months and later on developed afebrile tonic clonic seizures and febrile status epilepticus. Here, SCN1A is linked to Bilateral tonic-clonic seizure.