Dear Joy thanks for the query.Baby feeding is an art to be learned and it is most tricky.You had not done anything wrong by feeding him for six months.Have an habit of making him eat with whole family.Stop giving him tea,too much of milk or other snacks like biscuits etc if you are giving.Do not offer him anything before 2 hours of lunch or dinner.You can give lots home made nutritious foods like fruit juices,dal,roti etc.Try make things look attractive and tasty so as to attract him to food.Take help of your family members and elders in the family in to this.Try to see a doctor for any deficiency or worm infestation that he may have.