The experts say that middle children often feel left out and invisible, a contrast from their older and younger siblings. While older children get the benefits of all of the “firsts” a child accomplishes, younger children benefit from the emotional impact of being the baby of the family, often being spoiled and coddled. Middle children, however, often feel as though they have nothing special that is just “theirs.”
Over the years I find that I can often correctly identify a person's 'birth-order', by certain behaviors or traits they exhibit as adults.
Myself, I am the youngest of 7 children, and I can say that even today, I clearly identify with the younger, coddled baby of the family, and thankfully a more independent, confident adult..