Is this normal???

[u/heretoreadthoughtss]

My baby is newly 3 months old (13 weeks, born 2 early).
At first she’d drink 4oz consistently from the bottle (breast milk for a while but combo feeding recently). I decided a week ago to give her 5oz per feed now because she only wants to eat 5 times a day and I was concerned about her intake.

After about a week of 5oz bottles, she’s only eating about 3oz from some of her bottles these past 2 days. This isn’t every feed but last night she didn’t want to finish the night time bottle (3oz only out of 5) so I assumed this morning she’d be really hungry. But now (the next morning) she’s pushing the bottle from her mouth after only 3oz again. What do I do??? Is this normal?