Phlegm/mucous

Hi, my baby is 2 week+ old and he started making "snorting" noise like a little piglet so we suspect that he may have some mucous. Sometimes he fell into deep sleep but woke up with discomfort and choking on the phlegm. There is no mucous flowing out. Please share with me any useful and safe methods to help baby to get rid of the phlegm other than using nasal spray. Thank you!