*hugs* how is he now?
your boy seems to get flu or cough quite often...
I'm not too experienced in taking care of sick children cos Christine has seen pediatrician 3 times.
She recovered from runny & blocked nose quite quickly after seeing pediatrician. I think she took about 3 doses of Zyrtec. I didn't give her the other meds as she was only 6-7 month old then.
I requested for a baby-safe saline nose drop to "clean" her nose as she often rubs her nose & eyes.
I bought extra bottles from pharmacy. We use it to clean her nose regularly as she has quite a bit 'pi-sai'. Salt water rinse is good for adults with sensitive nose (ie a lot of pi-sai or mucus). Babies tend to ingest the saline water, so you have to balance the risks vs taking medication.
every child is different. how long does your boy usu take to recover completely?
If the mucus affects sleep (breathing) or appetite (maybe irritated throat), then I think you may wish to consider visiting the pediatrician earlier.