There is no cure for the common cold you are just going to have to let it run it's course. You can put vicks vapor rub on the babies feet and on its chest, preferebly baby's own vicks they have some just for babies. Keep the baby from drafts if it has a fever give it a luke warm bath and wrap the babe in a warm towel. If the baby is having a hard time breathing and is congested turn on the shower to hot and steam your bathroom the steam will loosen the flem. Give lot's of liquids and offer offer puree'd fruits. and keep your baby cool if it has a fever. Give your baby lot's of tlc and lot's of rest. Good luck.
I was going to suggest a few things, but,with your son's
age....go directly to a Doctor!....You can't be too careful
with a baby!
plenty of orange juice and water
Give it up for adoption then you won't have to bothered with the cold or the child.
I think maybe at 7 months if they are sick they should see a doctor