Sipon na hindi mawala wala

Hi mommies outhere, i know this season was so cold and babies getting cough and colds. I have a baby 2month old. We went na before sa pedia then goes to admiting dahil nga daw sa pneumonia. After that, nawala namannkahit papaano yung sipon nya and no bacteria findings sa blood nya. Then last november. We went again pero sa center na. Niresetahan sya ng para sa sipon nya na hindi mawala until now. He's still have halak and hindi mawala talaga yung sipon nya pinainom ko na din ng oregano pero hindi nya naman na suka. What remedies po ang ginagawa nyo or paano po mawawala sipon / phlegm ni baby? Paano nya po kaya ito masusuka? . Thankyou so much for the responce!!