If you have any reason to suspect seizure activity, consult your primary physician or neurologist promptly. The vast majority of individuals with a FOXG1 mutation experience seizures at some point. There are many types of seizures, and they can present with or without the same symptoms as someone else. The Mayo clinic has some great information, take a look here.
Do not attempt to self-diagnose your child. Please contact your primary care or neurologist if you suspect seizure activity.