What’s the Situation with My Two-Month-Old Baby’s Constant Coughing and Whistling Sounds?

At two months old, my baby often makes coughing and whistling sounds, as if there’s phlegm in the throat. When feeding, excessive force can cause a buzzing sound in the throat. The sounds are particularly loud. A few days ago, I took them to an ear, nose, and throat clinic for a thorough check-up, and the doctor said there are no issues with the lungs or throat. What could this be?
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