Baby gasping for air been to 3 different hospitals

My baby is 3 weeks old and gasps for air all the time and I’ve even recorded her because the doctors don’t believe me, they’ve told me it’s normal and it’s a reflux problem but she starts turning red I haven’t slept in days because I don’t want anything to happen to her she wasn’t a premie and no complications during labor I’ve been to 3 different hospitals but none do any tests they simply look at her when she’s not doing it and say “she looks like a normal baby to me” i think it could be asthma or lung problems or hopefully it’s not but i want answers but no doctor gives me any 😭😭