Spitting Up

My LO is currently 5 weeks old, and I feel like he spits up a lot during feedings. He is currently bottle fed breast milk. I sit him upright for feedings, take frequent breaks and burp him multiple times. He will spit up at all different times of a feeding - beginning, middle or end and sometimes all three. There are times when it seems like he spits up everything he just drank since the last burp. I feel bad for him because that can’t be fun, and it’s also frustrating for me. I’m going through so many outfits and burp cloths, and have begun to use receiving blankets instead because they’re larger and I can use them for a bit longer. I’m not sure what else to try to minimize the amount/frequency of spit up. Any advice would be appreciated!