RSV is a virus very similiar to the cold, but can be pretty serious in small babies. My son got it when he was 8 days old and spent almost a month in PICU on a vent and then another month at home on oxygen as he got a very severe case of RSV last winter (and was so young). The virus produces such a thick mucus that is clogs up a small babies' airways causing difficulty breathing. So, if you suspect your baby has RSV, the only thing you can really do is make them as comfortable as possible (sleeping in a swing or carseat and using a vaporizer may help) and then watch them carefully for any signs of respiratory distress. If you start to suspect he/she is having trouble breathing, take them to the ER immediately. The smaller/newer the baby, the smaller the airways are going to be.
at 12:55 PM on Dec. 24, 2008