bronchitis in baby

My baby sounds like he has a case of bronchitis. I have a homeopathic kids kit. I've successfully treated 3 kiddos before this one with homeopathic. He's 4 months old. We don't immunize either. I've been using HEPAR SULPH CALC. He's not any worse, but doesn't sound better either. He had one other time when he was 2 months old that he was coming down with a cold and Ferrum Phos. took care of that almost immediately. However, that was the second remedy we tried. Hard to diagnose with a baby that can't tell you how he feels. He has no fever. Acts like he feels fine. Not even cranky. He does want to be held somewhat more than usual. He woke up yesterday with a runny nose on one side that became thick within an hour of waking. That is no longer a problem. Now he sound somewhat congested in his chest . His cough is hard but short. Sounds like it hurts. He is hoarse when he cries. He goes to sleep easy but only sleeps for thirty or 45min. short nap for him. He looks like he has fever when he awakes from a nap, with glassy eyes, but I've checked his temp. every hour or so and he hasn't ever had any. He's breastfeeding and that is going normal so he swallows okay. Found on another website that Belladonna is the remedy. Sounds like it could work. I'm leaning toward the Ferrum Phos. though. Any advice would be appreciated. Also, I just noticed that you should only take one remedy at a time, even though sometimes more than one seems to fit. Any advice on closer diagnosing? And since I breastfeed, is there anything I could take that he would get in the breastmilk? I am giving him the tablets that go under the tongue in everything he's taken