sick baby

Alisha • AMS 8-5-16💕 MGS 11-13-19 💜
My daughter has been sick with a cold for over 3 weeks. Nothing is getting better she still can't breathe well which makes sleeping hard for her and eating. She coughs from mucus building up. I do saline drops, clean her nose out, humidifier, Vicks and steam showers. Not sure what else I can do? Any suggestions