You will find the time. If you work outside the home, it's perfect...go during your lunch hour, stay an hour later, or go an hour earlier. You will not have the "distraction" or guilt of your baby being right in your face all day. You will also not be interrupted so much, which drives me crazy when I have to stop my workouts...
I do not work outside of the home, but I have twins and my husband works crazy, long hours. I am by myself everyday with them. I have now settled to work out after they go to bed around 7pm...Yes, it is tough after a long day with them by myself, but onces I start, I am good to go. I go to bed about 10pm every night.
I really think that everyone has a "workout clock" when their bodies are most ready to exercise. If you can find that, you will be able to stick with it and plan your baby's schedule around that...I have always been a night workout person, for some strange reason and my mornings are too crazy - and I am too tired after them all night! ha