It depends, if he is taking as much as you can produce you might not feel 'full' as such, except after a longer break when he's not bf for hours. TBH that full feeling went away for me after the first six weeks or so anyway. It doesn't mean there was any less milk, it just meant my body had sorted out how much was needed. Don't take a lack of feeling full as an indication you are no longer making as much. Some Mums never get the feeling at all and have plenty of milk!