My 8 month old son sleeps around 11-12 hours of a night which is great, however, most nights he is still waking up for a feed, he was having 5oz which I have reduced to 4oz and he goes back to sleep after that but does he need this feed as some nights he just sleeps right through? I have tried giving him water to settle him instead of formula but it doesn't work. Should I reduce the amount of formula again or try and Cut out the feed all together?....