Body after baby 3

Amber
I had my third child 6/14/15
I have lost most of the weight I gained, maybe 5 lbs still linger
I cannot get my skin to go back though. There is a looseness about my lower belly that I don't think anything but surgery would ever fix. It's really soft and kind of sags. I hate the way it looks and feels and don't see a difference despite three months of running and calorie counting and nursing.
Anyone know how to make skin more firm? All I see are creams but feel like that's just an expensive scam.