At 20 days of birth & at 3 months my child suffered from seizure. Her EEG report shows seizure disorder (g.T.C.S-2 to hypoxic brain).What does it mean?

Lack of O2 to Brain. That means that his seizures are due to lack of oxygen going to his brain either before/during or after delivery he needs to be followed up by your pediatrician and padiatric neurologist.