That's true. Much of their behaviors also seem to come pre-written on their minds.
Stephen Pinker talks about it in his book "The Blank Slate - a Modern Denial of Human Nature".
Most of parents' efforts seem to leave little impression on the child's nature in the long run. Even the forcefully imparted moral values are held not as innate nature but as second nature which can either break under societal pressure or throw the child into confusion.
