Newborn always choking

It seems like my son is always choking , when I try to put his bunny in his mouth he seems to gag . When he’s drinking milk he gags (sometimes) and literally just sitting there he gags . He has a appt tomorrow I’ll bring it up but I was wondering if anyone else went through this . I ALWAYS make sure I sit him in his boppy after he eats but I don’t like him sitting in there long because I feel like his neck be pressing into his chest which can mess with the breathing (like if he was in a car seat)