Good day! My little one often regurgitates after feeding. He eats…

Good day! My little one often regurgitates after feeding. He eats voraciously and seems to swallow a lot of air. Even when he's just lying down after feeding, he still regurgitates. Does he raise his legs because of this? We see the doctor on the 20th. I wanted to know if you have ever experienced something like this? We are 3 months old and only breastfeeding.