Sensible proposition recently advanced by Nicholas Humphrey: for the first few months of life an infant possesses not one unitary self but several different sub-selves.
Native intelligence, memory, and the reception of sensory information. These seem to be the cores of the chief sub-selves Humphrey has in mind. Each has to learn that it is on the same team as the others, and ultimately each becomes a "faculty" of a single self.
This reminds me of William James' phrase "blooming buzzing confusion." The phrase refers especially to the confusion of the data of the different senses into one unhelpful congealed lump in the infant mind. But part of the confusion may indeed by the absence of a single integrated self to do the integrating of the data. They aren't on the same team until they decide that they are on the same team.