An area that has fascinated psychologists for most of this century is sibling birth order in relation to just about everything: intelligence, sexuality, personality, mate selection, etc. A quick review of the research shows that there is also great debate in how much of a role birth order plays in who we are. It seems for every study that claims to have a significant result, another one disputes the data. My personal anecdotal experience indicates that birth order and gender tend to affect mate selection as people seem to choose a romantic partner that matches some early life coupling. For instance, as a middle sister, I tend to be attracted to eldest born men. My little brother seems to go for middle or eldest females too. But again, this is just my speculation.
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In scanning some of the current research, here are a few interesting findings that might make you look harder about your objects of attraction and you ways of relating to them.
First of all, here’s a basic run-down of personality traits that tend to be associated with birth order. Do any of these characteristics resemble you?
Birth Characteristics
First Born
- More responsible then other siblings (Alder)
- Overemphasize the importance of law and order (Alder)
- Serious (Leman, 2000)
- Goal oriented (Leman, 2000)
- Conscientious (Leman, 2000)
- Well organized (Leman, 2000)
- Conservative (Alder)
- Emotionally intense (Koch, 1955)
- Upset by defeat (Koch, 1955)
- Higher esteem (Morales, 1994)
- Leadership characteristics (Morales, 1994)
Middle Born/Second Child
- Mediators (Leman. 2000)
- Acquire fewer problems (Leman. 2000)
- Set unrealistic goals (Alder)
- Achievement oriented and often fails (Adler)
- People pleaser
- Calm
- ‘Go with the flow’
- More cooperative than first born (Adler)
- Feel they are playing ‘catch-up’ to first born (Adler)
Youngest
- Entertainers (Adler)
- Pampered (Adler)
- Dependent (Adler)
- Selfish (Adler)
- Attention seeking (White, 2007)
- Lazy (Adler)
- Spoiled (Adler)
- More open to experiences (Big Five Personality Test)
Only Child
- An only child has no rivals for the patents’ affection and may be pampered causing later interpersonal difficulties.
- Only child take more internal responsibility for their actions because they never had other siblings to blame things on. (Falbo, 1981)
- Only child had a lower need to be sociable
In terms of romantic attachment style, birth order does not seem to play as big a role in partner choice, but it can affect emotions that influence relationships. For instance, one study from the Netherlands found that later borns were more jealous than firstborns, and that only children were only slightly less jealous than firstborns. So, it is suggested that the experience of exclusive love and attention in one’s childhood, leads to a lower level of jealousy among firstborns. In another study published in 2008 in the North American Journal of Psychology found that middle children had the most jealousy. Were us middle’s so neglected that we feel jealous? Another interesting finding of that same study is that the baby of the family grows up to be the biggest romantic.
One of my favorite studies showed that partners with the same birth order (two youngest, two middles or two eldest) did not guarantee a successful relationships. They could be happy or unhappy. Birth order wasn’t a factor. But this study found something else astounding: Birth order is a huge factor in unsuccessful relationships! A study of ex’s found that they are likely to be of the same birth order. Hummmm. Very interesting. The Ex who fathered my children is also a middle born.
As for sexual behavior, another study showed that later borns seem to desire more sex than first borns. Additionally, first born people desire to have children at a younger age, suggesting a greater pursuit of long-term sexual strategy than the baby of the family. The draw back to this fascinating study is that is was a self-report study and in my opinion, people lie about sex more than they lie about money.
And on the subject of romantic attachment, birth order doesn’t seem to be as influential as a mother’s attachment style. Mother’s don’t tend to change attachment styles between children and first-borns don’t show better attachment skills than second babies. I might add here, that this study didn’t look at later borns from very large families where a mother couldn’t possibly have the time to practice the a secure attachment style with a sixth, seventh, or eighth child.
Finally, back to the profile of me, the middle born. Yes, me, me, me, the ignored middle born. Middle borns express more positive views toward friends and less positive opinions of family in general. Could that be why I live thousands of miles away from my siblings, yet more than two-hundred friends recently wished me a happy birthday on line? Mating strategies are also a bit different for middle-borns. One Canadian study showed that middle borns are the least likely to cheat on a partner. Are you reading that, prospective boyfriend candidates? Of course, studies are just that. A study of a smallish group of people with an attempt to generalize the findings across a larger group. But this is one study, I’ll be happy to wave around.