Why is my daughter keep chocking

S

I have twins a boy & a girl both almost 4 months. Boy was breech. Both born emergency CSection at 36 weeks. When I was giving birth to my daughter she kind of had difficulty breathing. Anyways whenever she drinks milk I Burp her. Sometimes randomly she starts to chock! I even told the doctors they did checks on she said all is good. Once her lips went blue too that scare life out of me. Even then doctors saying everything seems ok. But why is this keep happening if everything is ok? She just randomly chokes ?? 😩