Breastmilk causing spit ups

Hi. Do you freeze your BM? I guess alittle spit up is fine. My baby does spit up too, and now I’m feeling that my baby prefers formula over BM from the way she finishes her milk. She is on BM in the day and FM at night. When I give her BM, she doesn’t finish them, it will take her 2/3 times to finish a 100ml milk. Each time she drink 40/60ml and I will keep the remaining back to the warmer and then give again within an hour. During the night or when we are out, she can finish her FM at one go, or only some leftover. She sometimes still does drink only 40/60ml of FM, cannot finish at one go like BM. But for BM it’s all the time leh I find it.. Please don’t feel like a failure! I just felt sad cuz I pump so hard yet she prefers FM 😅 what you eat does matters but I don’t think that’s the case because I eat very well for my confinement (she is now 2months, and I froze my BM since then).

Update: I've found out that it isn't because baby spit up more or is restless after drinking my breastmilk. She is just hungry more often and hence would cry angrily(because I didn't know she's hungry) , which leads to her spitting up. Now that we feed her every hour, she's fine and drinking well

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for breast milk mommy should try to avoid spicy food.eat more protein and fruit.also make sure not take drink or food can make baby bloated tummy