increase testerone in 4 year olds increases behavior problems

Is this true and does anyone know where it is documented?  4 year old boys... she stated that at the approximate age of 4, boy's testosterone levels double - then they go back down at 5.  This apparently is from a book called "Raising Boys" (don't know the author).  Supposedly this explains why boys become so "difficult" at 4 and then become "human" again at 5. Thank you

[Kevin Kennedy, Ph.D.]

Steve Biddulph, the author of ther book you cited, believe this to be true. In general, though, testosterone levels in the pre-adolescent years remain pretty stable and it is actually not true that four-year-old boys in general become difficult. This is not to say that Biddulph'd assertion is false - it is simply an excessively simplistic generalization.