Choking on his phlem

Patient: Hi There i am new to fatherhood and have a 8 month old boy whom is teething, he seems to be having problems with the phlem and seems to be choking every now and then. i am not sure if this is normal or should i take him to an ER. It is currently 1am here so not sure what to do

Symptoms: Teethinf, mild fever

Doctor: