That's so true. Most child psychologists nowadays (Jean Gebser, Jean Houston, others) tell us that, to an infant, the world (universe) is just one amorphous mass – of which s/he is a part, meaning there is no sense of separation between the world and the self. After a bit of time, the infant learns about Mom and Dad and milk bottle and pillow, etc, and the separation sets in ... along with knowledge.
That knowledge is essential for personal growth and to be able to function in society. As for that sense of separation, it might not be ideal.
Food for thought.
It might not be ideal... ah... yes. Then one searches for the ability to feel "at one" with everything again, for the rest of their existence...