Abstract
The main purpose of this article is to describe the path from symbiosis to fusionality, since, despite these two terms are frequently used in the psychoanalytic literature, they are often named in a way that is not always clear, especially the latter.
It is my personal belief that, instead, an explanation and correlation of these two concepts can be extremely useful and that, above all, it can help to understand the importance of studying the newborn for all the psychologists and psychotherapists regardless of the type of patient with whom one will work. The observation of the newborn allows in fact to approach those portions of infantile psychism that, escaping the evolutionary process, remain in the adult and which therefore always remains useful to keep in mind, not only as an immature and disturbing aspect but also as a creative and vital part of the personality.

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