It has back heat. For babies, I think back heat works best because the six quart tubs are so small the back heat does a better job at creating a heat gradient from front to back in the tub.
I'm not sure, but I think you can get the Reptile Basics rack with belly heat. Give Rich a call, I'm sure he would be more than willing to talk to you.
The larger racks come with either back or belly heat.