"Whether you're firstborn, middle child, last-born, or only child, birth order can have a big effect on your personality and behavior."
As the leader of the pack, firstborns often tend to be:
Reliable Conscientious Structured Cautious Controlling Achievers
"Firstborns bask in their parents' presence, which may explain why they sometimes act like mini-adults. Firstborns are diligent and want to be the best at everything they do. They excel at winning the hearts of their elders."
"The middle child often feels left out and a sense of, 'Well, I'm not the oldest. I'm not the youngest. Who am I?'" says therapist Meri Wallace. This sort of hierarchical floundering leads middle children to make their mark among their peers, since parental attention is usually devoted to the beloved firstborn or baby of the family.
"In general, middle children tend to possess the following characteristics:
People-pleasers Somewhat rebellious Thrives on friendships Has large social circle Peacemaker"
"Youngest children tend to be the most free-spirited due to their parents' increasingly laissez-faire attitude towards parenting the second (or third, or fourth, or fifth...) time around. The baby of the family tends to be:
Fun-loving Uncomplicated Manipulative Outgoing Attention-seeker Self-centered"
"Being the only child is a unique position in a family. Without any siblings to compete with, the only child monopolizes his parents' attention and resources, not just for a short period of time like a firstborn, but forever. In effect, this makes an only child something like a "super-firstborn": only children have the privilege (and the burden) of having all their parents' support and expectations on their shoulders. Thus, only children tend to be:
Mature for their age Perfectionists Conscientious Diligent Leaders"