Please give me your success stories with a feeding averse baby

My 4+ month old seems to have developed a feeding aversion. He was a failure to thrive after he was born. He just wasn’t gaining back to birth weight and now I’m just super paranoid he will continue to be that way despite him having excellent growth after he made it.

I definitely know my husband and I pressure to feed him. All of the things I’ve read about in what are signs of pressuring is what we do. I kept thinking he was just super gassy from the formula and was in pain, but that’s not it.

I don’t really know what to do. He’s going to be so hungry and I don’t want him to lose weight. I’ll be reaching out to his doctor tomorrow. Any advice is appreciated.