My 3 month old baby boy.?

My son started doing the same thing around the 3 month mark too. I took him to the doctor and he had RSV. So we got him a humidifier and put some sea salt in it and just suctioned out him nose regularly and kept everything really clean. They said that's all we could really do, unless it got worse. And we had to go back in a week to see if it helped.Which it did, He was feeling better in about a week. He had a cough also with his that went away after about two weeks. Humidifier was a huge help! But i would at least make an appointment for him just in case.