It's a good question. Of course...That one here claims too know that is all a stupid scam. No one of us can really know. There is no way. And that is why there is so many explenations and theories. In fact, there is at least as many theories of life as there is lifes. I would sugest you to try find your own version as we other who has answers have done and still do.
In my version of truth however you don't get "reborn" as such. You will cease to exist and you will create new life. We all had to learn walk, speak and so on. (of course this all depends on how you define "life"

We can remember bits of our past lifes, yes. But obiusly nobody can walk, talk and eat normal food the same day she is born. Not what I heard of anyway. I do in fact beleive that energies can be mixed. For insance, Are you sure that your nighbor is 100% pure human? Is that becouse he looks human? Maybe he is, lets say, a hybrid? Half man, half cow? Yes he loves food and to sitt on his coach just thinking about life or watch his wife stress around. Or maybe Your other nighbour.....Maybe she is half human and half wolf...Yes, isn't she a litlle "overprotective" of her family and friends. She is rich and very generous to the people she loves. But other says she is close and greedy?
My point is...Maybe we split up when dead. We gives parts of our selves to universe to create new life. We may not be reborn as a human, maybe a tree or a pig. Maybe there is someone out there who was the same person as me in a erlier life.
I don't know, you don't know And no one on this site knows either. I'm afraid there is nothing here to "get right". there is only theories and specualtions.
My counterquestion to you will be... What do you believe? If you don't know, then I sugest you seek that answer out. But not here, not on any other forum either. Deep inside yourself is the answer, I promise you this. And if you find that answer, You will be able to whrite your own uniq self based theory exactly as I did now, and as so many other has done before
In this problem you are the salvation. Not us.