Krista, I bf Liam, so don't really have much idea on the amount of milk he takes. he has 4 + sometimes a night feed of bf. & I don't measure solids, But he eats heaps. He is a Very big boy, has been from birth (10lb 4oz/ 23 inches) & now is over 23lb/32 inches. So given he is the size of most 15month olds, his eating isn't much of a guide.
I do know Australian recommendations say 600mls (20oz) is fine at this age. That is with solid intake.
I think you need to be guided by Megan & not books etc.
Gosh a 3rd on the way & a non napping 2.5yo

. I am lucky Aiden still naps, but the trade off is he only sleeps 8.30pm to 6.30am... dh decided as he does Aiden's bed time most of the time he wanted play time, so it went from 7.30/8pm to 8.30pm. So I can understand why you do what you have to.
Our day is mixed around Aiden's activities & his nap.
6.30/7am wake & bf
7.30- breakfast
9/9.30 nap (sometimes only 1/2 hour to make swimming lessons at 10am - up t0 1.5 hours)
expressed bm from a sippy about 3oz on waking (10.30)
11.30/12 Lunch
1.30pm Both boys nap
3/3.30pm wake up & bf
5pm Dinner
6.15pm Bath
6.45pm settle & bed
last night 8pm finally went to sleep after standing up 100's of times...
He then woke about 5 times before 10.30 & then made noises at about 1am & then fed at 4am & then again at 6.30am
We are still getting back on track with milk supply issues & sleep issues from 4 teeth over 2 weeks & increased mobility... it is so frustrating, but I think/hope I will get there soon... only for the next blip... remind me again why we have children

(only kidding there)