my son is four years old.he got loose stools two months ago and is still having these.he took two (ten days course)antibiotic courses.but it only improed a .bit only during the treatment.now he has 5-6 loose motions a day sometimes in start the stool appears as normal and then turns to loose.the stool colour is normal (yellow/yellow-brown).we carried out his normal stool tests for infection and blood occulent test and those are clear. to tell you his medical history,he took lactose-free milk since he was two months old and got acute diorreha when he was six months old.please help me.