But far from being apathetic or withdrawn, researchers found that a middle child's place in the family helps them develop negotiation and communication skills.
Psychologist Catherine Salmon claims that middle siblings are more likely to 'become agents of change in business, politics and science'.
And they are also more likely to be faithful spouses, have the drive to succeed in the workplace and be motivated by fairness.
"As children, middles have to wait a lot. Modern middles wait while their younger sibling is loaded into the car seat," the Daily Mail quoted Professor Salmon as saying.
"They wait while the firstborn performs in the recital. They wait to be served at the dinner table and complimented for their hard work in school. Middles are accustomed to not getting what they want right away.
"They learn the art of delayed gratification, and this helps them later in life," she explained.
However, Professor Salmon also found that middle children report feeling more distant from their parents and are more likely to be easily influenced by their friends.
"Middles get less time, attention and resources from their parents, and they often suffer from this. But this suffering seems to be short-lived," she said.
"As is abundantly clear, this lack of attention can lead to the development of some extremely useful skills," she added.