We all just had this, bad cough with mucus, then it turned into runny/stopped up nose, my kiddos dr said it was allergies, but to my knowledge allergies are not contagious LOL, no we all ended up with it one at a time, even my sister, we still got it two weeks later (not all of us just the baby and my sister), my sister got the vomiting and fever though (we didnt have that), i think its a virus or something that is going around, everyone in our small town has this. I used zicam on myself, my husband and my oldest son who is 3 1/2, it is a homepathic cold med that you can get at walmart for $9, we use the one with the "qtip" and you put the med in your nose. clears it up fast, the quicker you use it (at the first sign of you getting it) the faster the med works and gets you better. It says to use it once every 4 hours but i did it on me 3x day and my son 2x day. Good Luck, hope your baby gets better soon!!