What can I do or eat to loose a belly fat?

I weight 113 pounds, i'm 5'2, I actually don't look fat at all, is just that i used to be very skinny, I was 103 pounds and to be honest my was pretty small, I ate a lot because for some reason if I eat a lot it gets bigger, but so my belly... Anyone now how can I eat or what can i eat, so I can at least loose about 4 pounds from my belly without loosing my fat. I have the AB Rocket, the thing is I think I have a small umbilical hernia, so i don't want to do abs.... I just want to know what can I eat or do to just reduce my belly.