New Mum, hoping to lose 100lbs!

Hi Everyone!
I'm brand new to the message boards, but I've been using MyFitnessPal for a while to track my food intake. Holy heck do I love the accounability.
I am a brand new Mum. I had my first child, a little boy, just over 5 weeks ago. Prior to pregnancy, I was about 180lbs and a size 8-10. Right now, I'm at 250lbs give or take, and wearing a size 14-16. I'm hoping to get down to 150lbs, but don't have a real time-line. 3 years ago I was a very active person, into running and constant exercise. I loved it. During that time I was about 130-150lbs, and I'd love to be there again one day. I know my weightloss goals are attainable, I've gone from 208lbs down to 150 in the past, and was soooo pleased with the results. I make a super hot skinny person ;-)

Right now, my basic stats are 28 years old. I'm 5"9, weighing in at 250lbs. I'm considered "obese" and I hate that. My immediete goal is to be near 225-230lbs by Halloween, which means losing about 25lbs in almost 60 days (I started September 1st).

I am starting Jillian Michaels 30 Day Shred on Monday. I'm still only 5 weeks post-partum (c-section), so I may have to take things a little easy.... but I did part of it as an "experiement" (as a "what the hell am I getting myself into") this morning, and it looks like it will be ok.... and I feel like my arms are dying! :-) I love that feeling!

What a long winded, boring intro! I swear, I'm generally much more entertaining...