You have not mentioned if the child was born preterm and whether he suffered from any oxygen crisis after birth. Generally in case of preterm babies or in case of children suffering from lack of oxygen (hypoxia) soon after birth, there can be brain damage which could be a source of the seizures. Alternatively, some congenital structural malformations like corpus callosum agenesis can also give rise to such seizures. A ultrasonography of the brain needs to be done in order to evaluate the cause. Treatment depends upon the cause but you need to continue giving valparin and tegretol. All I can say is that in most cases the seizures come down with age and treatment but it depends upon the extent of damage.