Treating cold for toddler?

My 16month old toddler seems to have come down with a slight cold. This is the very first time he has been sick that we know of. And were first time parents.

No fever. Just congested, very runny nose and a little fussy. Not really seeing much of a cough, if any.

How do you treat/help a toddler with a cold? Just let it run its course?

Of course if there is a fever or it gets worse we will contact a Doctor.