Make sure he/she is getting plenty of fluids. I wouldn't give anything accept formula or breastmilk and water because they don't need the sugar in juice, even if you water it down. Make sure he/she is having enough wet diapers eat day. Since he/she is sick, I wouldn't worry about solids if already eating them, just BM or formula, probably a little at a time and more frequently. Excessive sleepiness is also a sign of dehydration. To help with the congestion in the lungs, cup your hand slightly and pat on the back to help break up the gunk in the lungs. With RSV, a lot of times the mucas buildup will be thick and often hard. You can get saline drops to put in the nose to help make it easier to suck it out. Watch the breathing, if it becomes labored or his/her chest sucks in deep when a breath is taken, they are not getting enough oxygen.
at 3:23 PM on Mar. 27, 2009