When does a infant loud scary breathing and struggle of breathing and swallowing get better?

My baby’s doctor told me that it’s normal for my baby to sometimes struggle with breathing and swallowing. That throughout time it gets better. He makes loud sounds that sound like a horn. I’am just wondering when do they start getting better breathing and swallowing? I get pretty scared easily. I’am only feeling okay about it because his doctor had a conversation with me about it and she’s actually heard him do that weird breathing when he went to his checkup.

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