Hey there-
I'm new too.
I would advise against taking any pills for weightloss, especially if you are breastfeeding.
Walk on your treadmill 3-4 times a week for 30 min (I like using the incline... you work harder without hurting your knees). You can buy a few dumbells and ankle weights and add easy at-home resistance training too.
Eat fruit, veggies, lean meat and the most unrefined grains you can when you are hungry. Don't stuff yourself and don't eat anything beyond a piece of fruit when you are not hungry. <--- When I follow this it works. When I don't follow it, I gain weight.
Best of luck!
-RR