In my case, I usually IF from dinner to lunch and do just fine supply-wise. Just got back to work last week and started really pumping so i am taking fenugreek to help me over that hump.
Some of what you may be seeing is fat, some may be loose skin from the baby. You might not be able to make a huge dent in that -- especially while BFing since supposedly some women's bodies hand onto a certain amount of fat while BFing "just in case".
But since your baby is eating other foods and you therefore don't make quite so much milk, i doubt that's relevant. I thought last time that that was why i was starving all the time and couldn't lose weight BFing... But I'm losing weight this time and without the supply issues i had last time, so I know it's my primal diet that makes all the difference!