Not sure if this helps ladies found it on baby centre website for post baby weight loss.
Don't go on a strict, restrictive diet. Women need a minimum of 1,200 calories a day to stay healthy, and most women need more than that -between 1,500 and 2,200 calories a day - to keep up their energy and prevent mood swings. And if you're nursing, you need a bare minimum of 1,800 calories a day (most nursing moms need more like 2,000 to 2,700 calories) to nourish both yourself and your baby.
I think I'll start by using 1800, then reduce to 1500 for a while x