Spitting up

My four month old spits up… Like a lot. The doctor says that it’s normal as long as she’s gaining weight. She is in 98 percentile so I’m not worried about that. I don’t think I’m over feeding her she seems genuinely hungry. It’s freaking out a lot. Could it be a formula issue? She’s been on kendamil her whole life, but maybe I should switch it? First time I’m here does anyone have any advice?