Stridor??

Hello all- I just saw someone in another topic refer to “stridor,” and it sounds exactly like what my daugher does. Once in a while, she’ll get this high-pitched sucking in of air, like she is catching her breath. She has done it from birth, and when I explained it to my doctor, he said that it’s just normal “periodic breathing.” Well, now that we know she has reflux, I am wondering if what I am hearing is stridor? Does anyone else have experience with this? I notice that Sadie does it more when she’s lying down, even on an incline, or when she is eating sometimes- Is this reflux-related? Should I be concerned?

Any advice or experience with this would help ease my mind!