First Child: perfectionist, reliable, conscientious, a list maker, well organized, hard driving, a natural leader, critical, serious, scholarly, logical, doesn’t like surprises, a techie.
Middle Child: mediator, compromising, diplomatic, avoids conflict, independent, loyal to peers, has many friends, a maverick, secretive, used to not having attention.
Youngest Child: manipulative, charming, blames others, attention seeker, tenacious, people person, natural salesperson, precocious, engaging, affectionate, loves surprises.
Only Child: little adult by age seven, very thorough, deliberate, high achiever, self-motivated, fearful, cautious, voracious reader, black-and-white thinker, talks in extremes, can’t bear to fail, has very high expectations for self, more comfortable with people who are older or younger.
While I agree that this is something that might be true, however, from my own experience, many of these conclusions don't work for people whom I know personally.