how much milk intake?

Dear mummies, my baby is going 7 mth but is still drinkin about 150ml of milk each feed... should i increase to 180ml? But sometimes he doesnt finish his milk... He is also not sttn n we always feed him when he wakes up... should we not feed him as i read that babies abv 6 mth shud b able to sttn wo needing to b fed?