I would like to let you know that I tried GM's suggestion for 200c Sulpur and things seemed to have been working well.
The 17th month old has been feeling much better although he still sounds like he has some kind of rattley mucus in his chest.
He had received a slightly higher potency of Phosphorus and then a few days later I tried the Sulphur. His nose didn't clear up for another week after that. He didn't have any other nebulizer treatments either. His chest does get wheezy.
Over all he is doing fine.
Thanks for your suggestions!