If you already had the baby, CONGRATS! If not, keep pushing!

Anyways, something to remember is that breastfeeding is a major weight loss aid. Your body will burn so many calories just working to feed your child that you will drop weight without even trying. Also, a true low carb diet (natural, whole foods without junk or processed items) is perfectly healthy during pregnancy and breast feeding as long as you aren't trying to stay on induction. Most people normally eat way more carbs than the body requires, so if you stay at a reasonable level of carbs, as long as you are getting enough fat and protein, your body will make what it needs to feed your child all the nutrients it requires.

Good luck!

PS: If you have trouble breast feeding and want to use a bottle, you can still have the same benefits by pumping your milk, it is free, results in fewer allergies for baby, decreases the childs risk of some cancers for you both, and has been linked to a decreased risk of obesity for the child (and overall better lifetime health).