Is there anything to the theory that personality is affected by the order of one’s birth in relationship to the birth dates of one’s siblings? What about the personality effects from being the “only child” or what about twins? Read the article Birth Order to learn more.
What is this thing that some folks refer to as middle child syndrome? I suppose you could read the article entitled Is there Something Called the Middle Child Syndrome? from India Parenting. Then you might read the very, very short article What is the middle child syndrome? Here are some characteristics of the middle born child or children. in which the title is almost as long as the entire article.
One more recommended reading for you is from Stacy DeBroff of momcentral.com who offers advice on raising three children. Her story is entitled What are the effects of ‘middle child syndrome’?