No fixing character flaws. Pattern formation at birth and developed during childhood.

 Once the pattern is formed in the person's character it is almost impossible to change.

I suspect the character and personality tendencies is already there at birth and then formed during infancy and early childhood.

The child observes and absorbs all people and things around them and develops their thinking patterns.

They learn to do what works for others around them, adults or other children, and will use these methods throughout their entire life.