I did with my son. I have small nipples and he could not latch, despite every attempt on the planet to do so. I pumped for three months exclusively. It was exhausting. ALthough I know that many people feel strongly about the best food beign from teh breast, there is a fine line when exhaustion kicks in. One of the challenges with pumping is that your milk supply is HUGE, so the milk is not that fatty, and not as satisfying for baby. As well, you pump ALL THE TIME! I did it as long as I could, ended up with drug resistant mastitis and was in the ER on vancomycin IV. That is when we switched over to formula. If I could have nursed, I would have. But I found a great relief in formula. Getting sleep. I was pumping and feeding and cleaning all the time, ended up with some bad post partum depression. I must sound terribly negative, but I want you to know that you have someone to reach out to if you want to talk about your choices. I got a lot of criticism in my community for bottle feeding. My son is off the charts bright and very healthy, so I figure that formula did just fine. I am due to have my second baby any day now, and plan on going straight to formula.