Hi Ali, I'm a personal trainer and I'm not sure what the latest DVDs are but you should really keep at the elliptical...if you increase the time you are on it each time by 1 minute in a few weeks you will be doing enough to get some benefits. Really, anything is better than nothing. I also wanted to say that while pilates, yoga and cardio are great you really need some type of resistance training. You can use your own bodyweight, dumbbells, stability balls, etc. Many women think that cardio workouts are the way to lose weight but resistance training increases lean muscle mass and boosts your metabolism so that you are a calorie burning machine even when you are not working out. A good program includes cardio, resistance training, flexibility and good nutrition. Don't diet, just make better food choices.
I hope this helps you on your path to a healthier, trimmer you. I'm not sure if you have them in your area but Baby Boot Camp classes are a great way to lose the baby weight. In the Philadelphia area we have Toddler Friendly classes too. Check out www.babybootcamp.com to see if there's a class near you.