Sick baby

My daughter (3) and son (7 weeks) are both sick. Their both coughing horribly and their noses are so stuffed up. He's barely wanted his boobie today which isn't like him at all. I use to take my daughter to the doctor all the time so I know their not gonna do anything for him except tell me to use vapor rub, vaporizer, saline for his nose, stuff like that. Now my question is I have a nebulizer machine (breathing treatment) they gave me for my daughter one time when she was sick and I was wondering if I could use it for him too? I have sodium chloride for it which I was thinking would be like using saline for his nose. But I wasn't sure if it would be okay to do that.