Night weaning from bottle

Hiya am really looking for some advice my little boy is 6 months next week and goes to bed at around 7pm has about 2 ounces before bed then porridge wakes around 10 pm takes around 2 or 3 ounces then wakes at around 1, 3, 5 and up at 6:30 am. He used to sleep from 7 till 11 then 3 and wake at 7! Is it just out of habit now he wakening? Surely he can't be hungry he has porridge when he gets up a fruit pouch at lunch a jar at dinner and then porridge and has 3, 4 ounce bottles during the day. Should I trying giving water during the night? Thanks!!