I'm struggling with this too. She just never really seems satiated with the amount of solid food she gets in the day. She turns 1 tomorrow and I keep seeing that we're supposed to be done with formula by now, but that doesn't sit right with me because I want to make sure she's getting enough nutrition. (And I have two tubs of formula left that I don't want to waste anyways ugh) And she wakes up hungry once a night too. Definitely going to be a topic for our pediatrician as well. I'm going to go with the "every baby is different" route atm and assume it's fine if we feel we gotta still supplement with formula a little longer.
So I was told my pedi the most I could give him was 24 ounces. I split it up in 3-4 bottles depending on what kind of day we are having. Since your baby isn’t sleeping through the night I would save the larger bottle for night & you can even add some baby food or oatmeal to help fill him up. But we do a 8oz when he wakes up and 8 ounce with baby food before bed.
I'm having the same trouble with my daughter. We actually wound up adding an extra bottle instead of reducing. But she also 3 three meals and 2 snacks a day. We have her doctor's appointment next week, so I'm just running with it at this point. She turned 1 about 2 weeks ago