@Nathalie oh I feel you and how did u rectify the problem?
My supply regulated. I had an oversupply so my milk flow was too fast. I stopped pumping to regulate my supply. And around 3 months and a half I started making less milk and I didn’t have a letdown that was too fast. I used to hold her up and burp her and it didn’t help. But my supply regulating helped a lot
My baby had reflux when she was 3 months and under. Cuz my letdown was too fast so she would gulp a lot of air and not want to latch properly