Hello! I really need advice from experienced moms! The situation is …

Hello! I really need advice from experienced moms! The situation is this: my son has been breastfeeding for six days now and we finally learned how to properly latch him on. For a few days we were able to feed normally, but then it started: only when we lie down with him, correctly grasp his breast, hold for a couple of minutes and it starts horror. The son wriggles, cries, coughs, sometimes turns into crying... He's screaming that he's losing his breast, hysterically grabs back... As a result, he sucks in too much air. Yes, problems with the tummy started very early - after a few days, they are not yet noticeable. Maybe someone can suggest a feeding