My baby is 4.5 months old, I hear sort of noise while she's breathing but it won't be there while she's sleeping. Anybody know why is it like that

A. Mam you have to check with your doctor this week it’s very difficult to confirm because of the child is having this sound when the child is awake but not during the time of sleep it’s better to check with your doctor and they will confirm if there’s an issue that you need to address to