Alfred Adler in the 1930s, for the first time suggested the idea that birth order can have a lasting influence on personality and behavior According to him the eldest child is socially dominant and intellectual, but tends to seek approval from others because he is no longer the center of attention following the birth of a sibling; that the middle child, being sandwiched between older and younger siblings, is competitive and diplomatic; and that the youngest child tends to be selfish and demanding, since he is used to being provided for.
Oldest child (more exaggerated if male)
Don’t be a child
Don’t be important
Largest ego states
Adult and Parent ego states
Youngest child (more exaggerated if female)
Don’t grow up
Don’t be separate
Largest ego state
Child ego state
Winner or loser
Three children is the maximum that one parent can emotionally cover. After that sub groupings amongst siblings will form. Sub groupings are when two or more siblings establish a Parent Child relationship between them. The parent role sibling will exhibit oldest child qualities and the child role sibling will exhibit youngest child qualities. This may be encouraged by the parents.
Only child is usually an exaggeration of the youngest child qualities