My earliest memory is probably from when I was about 1 or 2. I remember being in one of those chair things for babies that has wheels and allows you to roll around. We were living in an apartment in Chicago at the time and I remember wheeling to the bathroom and unrolling all the toilet paper. I don't know why I remember this particular memory, I think I just happened to do that a lot.
I definitely don't see myself as being the same person as I was then nor do I particularly identify myself with my baby self. I would probably say that I would have to go back to maybe sophomore year of high school in order to feel like I'm mostly the same person, or at least can majorly identify with that past self.