Don't crash diet.
To lose a pound a week, you'll need to limit yourself to 2,000 to 2,200 calories a day if you're breastfeeding -- 1,600 to 1,800 if you're not. You can add extra calories if exercising. But if you attempt to crash diet and eat significantly less than that, you'll quickly regain any weight you lost. Create a two- to three-day menu plan to serve as an initial guide to get a feel of what those calories feel like spread over the course of a day.