My son wont sleep please help?

he is 6 months old and wakes 3 or 4 times a night. he isnt hungry because he only drinks not even 60 mls of his bottle and he is on solids and he isnt teething at the moment he has done it for a while now what are some remidies to gethim to sleep? i will rock him sometimes but he gets heavy and he has a bath before bed and he eats all healthy fruit and veg HELP