You should certainly think about the health of your body before the vanity (for lack of a better term) of you losing weight. Do not do this or any other cleanse while your are breastfeeding. There are far too many nutients needed for a healthy baby that are missing from this diet. Particualrly amino acids derived from meats, dairies etc. This is the most important time in your child's life for developing immunity against disease. Don't forget, that with this cleanse, you have an increased level of toxins storming through your body during the first days. Your baby will have those delivered to him/her directly through whatever milk you may be able to produce. I would suggest keep the nurishing and natural breastfeeding, through the breast (bottles are bottle feeding with breastmilk - remember, there's more to it than just a meal, its a psychological act as well for your little one).
Want to loose weight, concentrate on healthy meals and exercise. Two things YOU and YOUR BABY will benefit from......