C.C.
K.,
I've always been a working mom - went back 6 weeks after my first was born, and was able to take 8 weeks after my second was born. It was hard going back both times. Life felt so wonderful and so easy when I was on leave, and going back into the corporate grind was hard. But by the same token, I also enjoy my work and then had the feelings of guilt for enjoying my work... it's just hard making the transition back to work. I know how that goes. =)
I think the #1 thing you can do for yourself is to get the best child care you can possibly afford. As another mom already said, as long as your baby is receiving loving care from someone, she will be fine! We ended up hiring the most fantastic nanny and to this day, I am so thankful for all that she taught us about parenting! (She had 7 kids of her own and a whole bunch of grandkids, so she knew a thing or two about babies!) Honestly I think she was a better mom than I could possibly have been, since she had sooo much experience doing it. My daughter loved her and so did my husband and I. That made it easier getting in the car every day and going to work. I knew while I was at work that I didn't have to worry, Rosa was taking great care of my baby girl and they were having a great time together! So if you are totally comfortable with your daycare situation, that will really help.
And, as obvious as this may be, put a nice framed picture of you and your baby on your desk at work. Every time you get an e-mail or go to a meeting that makes your head want to spin off, look at the picture and remind yourself that you are at work to make a better life for your family. I had to do this about 50 times a day at first, and now that my kids are 7 and 4, I still look at their photo all the time.
As your daughter gets older, remember that you are actually setting a great example for her as a mom who has it going on! I work in an industry (construction) where there are not many women, especially not in a management role, and as such, my girls know for certain that there is NOTHING in this world that they can't do. Doesn't matter if they want to do something that is typically a "man's job," they see me doing it every day, and they know they can, too. I am proud to have modeled that for them. So keep your chin up, I know it's hard but you will do fine and so will your baby! =)