I'm all for trust the doctor like some have said, but sometimes mom's just "know." I have a 2 yr old who got RSV when she was 4 months old and it has led to asthma (or RAD) depending on who you talk to. I would do what the doctor says, try the vicks vapor rub (there is a baby one that would be safer), and I recommend the warm mist vaporizer. My son used the cool mist, but with breathing issues, her dr. recommended the warm for my daughter. The most important thing I would tell her is to listen to his lungs herself (put her ear to his back, and chest and listen) and if there is a change (eg she starts hearing rattling, or labored breathing) call the doctor and get him back in. I often do this with my little girl, as she has issues from time to time, and I can sometimes hear it coming when I listen to her back or chest. When breathing problems are caught early they're usually less severe. Best of luck to her.