It is normal to lose weight when you are breastfeeding. It is important that you do not lose weight too quickly. You should avoid unbalanced diets and eat enough. If you lose weight too quickly, this can have negative effects. You may feel tired and exhausted. It can also affect your milk production, which means you may not produce enough milk for your baby. To avoid this, you should lose weight slowly and steadily. You can also lose the weight you gained during pregnancy while breastfeeding.