DS is not even a month old and he seems to have phlegm trapped in his throat as well as a stuffy nose Sometimes I can hear the phlegm when he breathes. It's really worrying me because when he tries to cough it up or swallow it he starts to choke on it and has a lot of trouble breathing. His throat and chest retracts and gets all constricted and I'm terrified he'll choke on it and stop breathing.

What can I do to get rid of it?? I hate seeing him so miserable and frustrated