Baby drinking enough formula?

I'm worried my soon to be 9 month old is not drinking enough formula. Here is an example of what he eats (to add, he is almost 23lb, no teeth, and drinks a half cup of water a day):

Morning: 6oz bottle (1 scoop oatmeal)

Breakfast: 2 mini pancakes, container yogurt, 4oz jar fruit, puffs

Afternoon: 4-6oz bottle (1 scoop oatmeal)

Lunch: 4oz jar veggie, packet of applesauce, cheese

Snack: Puffs or 2 arrowroot cookies

Night: 6oz bottle (1 scoop oatmeal)

Dinner: 3 or 4 mini ravioli, 4oz jar veggie, bread