My gosh honey...it has only been 7 weeks:) GO EASY ON YOURSELF!!!! 25 lbs is a ton to drop right away. I had my baby almost 8 months ago and it took Weight Watchers to get the weight to continue falling off. I started 3 months after I had him and lost 23 pounds so far over and above the 17 lbs I lost w/in the weeks post partum. slow and steady gets you the most long term results. Clear it with your docor that you are able to exercise and it will come off but do not starve yourself especially if you are breastfeeding. You need the extra nutrition and calories to make milk.
I personally found breastfeeding to have absolutely no correlation to my weight loss with my first baby as did my sister with her two. I did not breast feed my second and the weight came off MUCH FASTER this time around. I was still carrying baby #1 weight when I got pregnant the second time.
be patient, be smart, and be safe:) It will come off!