I bought some child development college textbook, which I thought would be more useful than it was; it was much broader and described (in stereotype) groups of society's children. I forgot if I mailed it to my sister, or meant to mail it to my sister, or donated it to the library. It did say that two years old looks for security (stability leads to bravery and independence) and four years old studies on boundaries and independance. Meanwhile even though asynchronous gifted kids are observant and insightful and conversational there is something called the Prelogical stage (Piaget version, not the classical liberal arts definition of "Prelogical").
http://media.lanecc.edu/users/kime/Psy201lifespanB.pdf
