S.W.
I nursed while I was pregnant too. Remember you need an additional 1000 calories on top of your regular amount. Things like peanut butter (natural) are an easy way to add extra fat & calories. As far as anything I cannot think of anything else really. I started out a little overweight when I got pregnant with my son & was nursing my daughter. I lost 10 lbs in the beginning & did not gain any weight until my 6th month (after which I put on 35 lbs). He was born a healthy 8 lbs 8 oz & was a week early. So don't be worried about harming your baby by nursing your body will make up for it. Just make sure to eat plenty of healthy foods as well as some treats don't worry about overeating. The weight will really melt off if you are going to tandem nurse.
Brekka