Isn't eating as much

My LO is 4 months. She was fairly consistently eating about 26 oz a day. At her last doctors appt. He told me to drop her 11pm feeding that I was walking her up for because her weight is good ( from 20th to 40th percentile). I told him that I'm worried that she wouldn't get enough. He says that she'll eat more during the day to make up for it. Well it's been almost a week and she is only taking 24 oz a day, and that's a struggle. She has never been a good eater, but it still worries me. Especially when I hear of other babies drinking 6 or more oz a feeding. I'm lucky if she'll take 4. Like this morning I struggled to have her take 2.5 oz. She seems to suck down 2 oz then isn't very interested.

Anyone else have this issue, how are your babies doing?

Another note she has been spitting up a lot the last 2 days.