If you have an explicit memory of the traumatic event, no matter how early, then what's stopping you from bringing it up and talking about it? It seems like if you can remember it, then you would be able to talk it through.

For some people they have preverbal stuff that they have no memory of except for body/emotional memory. In that case, it might be easier to work through with someone who is trained in a body-focused therapy such as Somatic Experiencing, because you can work through trauma in that modality without ever having to remember the precipitating event. In my therapy I have worked through a few things that I had no memory about or explanation for, so I suspect they may have been preverbal, but really it's impossible to know. The main thing is to be able to feel the feelings, soothe/regulate them, contextualize them ("these feelings are a memory"), and separate them from whatever is triggering them in the present.

I don't know if that helped...