No, don't medicate unless you are sure of the issue.

As for your smelly baby, try adding probiotics to the water, if you don't have any or can't find any make a mash with chick starter and plain yougart and feed that a few times a week.would it be okay if i put the chick on corid for 5 days along with its little companion they are almost 4 weeks old

Hopefully the yogurt will take care of things. Please continue to update OP.