Cough 🙁

Any suggestions about helping my 4 m.o. with his first cough? It's a bit croupy sounding, and hes sneezing a bit. I'm going to take him in the bathroom while I shower for the steam. We also have a humidifier, and I breastfeed him so I'll do that. Is there anything else I can do? He has a pediatrician appointment on Tuesday and I'd rather not take him in before that, so any tips are appreciated, thanks!!