Baby at birth has not yet built-up all of his neural heritage.
As he grow, accumulating learning, child becomes more "intelligent" and more "social" like the society in which he live.

At birth, doesn't child already have all the computing power, intelligence and assimilation ?
How to explain that children have spoken a common language in their cradle (Jessus).

Biologically, brain difference between adult and child resides only in the volume (maybe the volume of the hard disk and stored info)