I don’t know if this is just a weird habit or my daughter is actually sick?

She keeps gasping for air when she breathes in. Her chest looks normal and doesn’t look like it’s being pulled in and she doesn’t look like she’s struggling to breathe. She doesn’t do it all the time, only sometimes, so I can’t tell if she is just doing that because she’s just experimenting with her voice or if she’s actually sick. She doesn’t have any other symptoms so I’m thinking it’s something that she is doing. Either way, it scares me and I’ll probably end up taking her in to her pediatrician. Anyone else’s baby do something like this?