Wow this post is me! I too have a 4month old. We have this issue with my husband's parents (half of them anyway). We told them at the hospital after delivery if they wanted to hold him they must wear a gown (because he MAY have CF) to avoid 3rd hand smoke. They refused and left. Did not hold him until he was 3 months old where we made them wear a gown. Told me I was "pissing in the wind" trying to protect him and told me 3rd hand smoke was a myth. At that point, they were asked to leave my house and informed that if they continue to give me grief they would not see him or the other grandchildren anymore and that we no longer would be coming to their home regardless. It's a real shame when people ar ignorant, but this is your baby and your baby's life....it's up to you to protect him and save those lungs. Don't back down! God bless you.