K.C.
Jen,
I am in the same boat. My son is 2 and a half and my daughter is 4 weeks old. What helps is we found out my daughter has acid reflux, so that's part of the fussiness. She is now on baby pepcid, I also go a moby wrap. It helps settle her down, plus then I can chase the other one easier. :) I also got a busy toddler book. There's tons of cheep ideas of stuff to do with him. I found when he has something to do he get's in less trouble. Another thing that works for us is the shower. I know it sounds weird, but I put a few toys on the gound and hold her. It works for us. Good luck and hang in there. This too shall pass.
K.