Girls, hi. The baby (3.5 months old) has a stuffy nose, he's straight …

Girls, hi. The baby (3.5 months old) has a stuffy nose, he's straight wheezing. A week ago they had a cold. They said the lungs were clean. Now it's hard to breathe, not like usual. What helped you with nasal congestion? Aquarium child doesn't help us much. After that I tried to suck out, but the mucus doesn't come out like that.