Interesting? Phlegm or mucous is a natural process of mucous production. If there are irritants or infections, more phlegm may be produced. Clearing this is usually by coughing or blowing. With a baby, excess mucous usually can only be coughed up by the babe. Otherwise you can use a suction bulb to help remove from the nose and back of the mouth. Usually nature will take the proper course & you do nothing.
Humification. Sit with your baby in the bathroom with the shower running hot water- this will steam up the bathroom and loosen the excess mucus. This will make it easier to remove by suction bulb.