A.H.
I think right now if you are nursing, this is your body's way of telling you to replenish itself. As long as you are making healthy choices from the cereal section - I see nothing wrong with it. I lost a ton of weight when I did this and nursed!
You want to be sure you are getting enough water as well - that keeps your supply up, as does the sleep. (I slept when my son did).
As you just had the baby, you have to take baby steps to begin your weight-loss process. I've seen too many posts come over for this and the desire for chemically packed diet pills - these cross into the breast milk! Please, know that you will reach your goal weight very soon as long as you keep patient for one. Second is to follow a healthy food plan. Especially as you are nursing. Just know so much crosses into the milk - so what you take it, so does your baby. (If you have gas, then so will the baby.)
I lost the weight by doing some yoga with the baby, drinking gallons of water before meals, making sure to get the sleep (house came last), I had more raw veggies and fruit and less meat. I also cut out fried foods...