How To Get Phlegm Out Of A Baby How Do I Help With Baby's Phlegm?

How do I help with baby's phlegm? - how to get phlegm out of a baby

My daughter seems to sounds from the nose and throat have. I'm sure it's the mucus or sputum. I tried to change the batteries nasal aspirator, but his nose is not runny nose. I think it was probably mucus in the throat. How do I know that you get rid of mucus or sputum, and how?