Searching Google for "belly center" I found several references to the Jelly Belly Center (on Jelly Belly Lane of course), some to this blog, and also this at almaas.com
Body Centers and functioning
Yes, usually the belly center has to do with embodiment, with the capacity to sense oneself. However, the belly center is also the will center. In a sense, the ultimate function of the will is to surrender to what happens, surrender to the now. And to surrender to the now means not to hold onto something. The true function of the will is complete surrender to what is happening without holding on. That is will. The essential self, like all essential aspects, can function in any of the subtle centers. When one is being the essential self, its location is usually the heart center. However, when the essential self is functioning in relation to identifying or disidentifying from any content of experience, it becomes associated with the belly center. The essential self is more like a potential for experience, and it also manifests as the capacity for identification. One of the results of the capacity for identification is embodiment. Embodying something means you are identified with what is happening. An essential state is present. You are embodying it if you are it. The true self has the capacity to identify with something you are experiencing, but it doesn't have to. It has a choice; it has the freedom. When you are the true self, you can become completely what is there -- one hundred percent. If truth is present, you are truth -- "I am truth". But the moment something else arises, you become that. There is no holding on. (Diamond Heart Book 3, pg 79)
It is interesting to note how the belly center seems to have to do with basic fear, basic sense of fullness and nurturing, and also surrender as Almaas points out here. Surrender has come up for me a lot since the early belly awakening some weeks ago, but I didn't make a connection with the belly awakening until I read this.
From a sense of separation, there is a basic fear, possibly also manifesting as an energetic hole in the hara region. And this fear and basic mistrust makes any form of surrender difficult.
When the belly center awakens, there is a deep sense of fullness and nurturing, of being held, of every cell in the body and also the emotions relaxing, reorganizing to a felt sense of all as Spirit. Realigning to the felt sense of a nondual realization. It allows for a basic trust at the bodily and emotional levels, no matter what else is happening. And this basic trust allows for a deeper and easier surrender to what is.