My 3 month old has a cold. What can I do so he can breastfeed properly?

My doc always keeps it simple. Breastfeed well. It gives the immunity to fight against the cold. Buy nasoclear drops at medical store. It is simple saline water. Just give one drop in each nostril, every one hour. It will clear the nasal congestion. I have been doing this for the past 5 yrs with my elder son every time he has cold and for my daughter who is 1 year. it definitely works.