Hi....so sorry your little one is not feeling well. It's so hard to see them sick. Especially two weeks...
Have you called the pediatrician? I'm sure they don't want to prescribe any meds being so little. I would try a humidifier in the room the baby sleeps in at night. You can get one with a vicks vaporizer too. I wouldn't use any over the counter meds or baby vicks being so young. Try to prop the baby up when sleeping too, just incase they are phlegmy and that will help from choking while sleeping. If you can't get rid of the cold for a while, you may want to ask your doctor about Acid Reflux. I sent out an inquiry a while back re my 10 month old with a cold that lasted forever. A lot of moms said to check acid reflux, even my pediatrician said if the cold is so persistent it could be that. We tested her and it came back okay (slight acid reflux), but it was ruled out. Good luck and I hope your little one gets well soon!