When our DD had a cold a few months ago we raised the end of her cot a little to help her breathe. We also steamed up the bathroom and had cuddles in there with her for a few minutes before bed time to help clear her congestion.

The best indication that your DS needs antibiotics is the colour of his nasal mucous. If it is a bright green it CAN (not does) indicate a secondary bacterial infection. Keep an eye on his temp and keep up the extra fluids.