how much do you feed your 6 month old?

Annabela
LO turned 6 months and has been sleeping thru the night since he was about a month old. Lately he has been waking up earlier than usual and I feed him and he devours his bottle. I'm thinking of increasing his formula. He currently drinks 6 oz every 3 hours. I'm thinking of increasing to 8 oz every 4 hours. What is your LO drinking? He also eats oatmeal in the morning and fruit and then veggies at "dinner."