Six guidelines for safe dieting during lactation

Wait until your baby is two months old before dieting
It’s best not to do anything consciously to lose weight until after the second month. This gives your body enough time to successfully establish a healthy milk supply that is less likely to be adversely affected if your caloric intake is restricted. Breastfeeding your baby, on average, burns 200-500 calories per day (above what you needed to maintain your pre-pregnancy weight) — so keep in mind that even without a weight loss program you are burning extra calories.