You need to wait until after your 6 week check up to diet and exercise.
Not sure don t have any babies yet.
It is much to early for you to be worried about this. Focus on taking care of yourself and your baby right now. Nursing burns about 500 calories a day so keep that up and you will be surprised how the weight comes off. You need the calories to keep your milk up so don t restrict eating. Get some sleep and enjoy that baby, the weight will take care of itself as long as you are patient.
Do not restrict calories at all. Eat healthy, but eat when you re hungry and allow yourself treats. Don t worry about losing weight until after your six week checkup. By then I d lost all the weight, but I was definitely not the same shape. I started exercising at that point and things are going well so far.Breastfeeding will make you hungrier than you were when you were pregnant (at least it did me) and it s important that you eat as much as you need.