IMPORTANT!! If you are breast feeding you MUST NOT embark on a weight loss program. I'm surprised your OB did not thoroughly discuss this with you.
Your exercise will have an effect on hormones released into your breast milk that the baby gets. Your body is still producing chemicals that will affect your joint laxity and weight loss, and your body's soul purpose now is to keep your baby nourished, your needs are second. Accept that.
AFTER you stop breast feeding is the only SAFE time to begin a formal weight loss program.
I'm not saying to stop exercising, but I AM suggesting you discuss this with your doctor,.... exercise, stay healthy, but manipulating your diet and
losing weight and over-doing it .... your body is not chemically ready for this YET because the focus is to preserve the baby. Your actions may be
counter productive.