Fathers shape a child's left brain towards the end of the first year, second, and into the third year.

“I've also suggested that just as the mother is shaping that baby's right brain in the first year the father is now shaping that baby's left brain towards the end of the first year second and into the third year that he's shaping that baby's his left brain to that baby's left brain that being the case he may also earlier on have had good exper experiences with that baby early on in life and a good example of that would be a father who is tender tender yet at the same time is instrumental and is teaching things about the world”