"Your personality is directly related to how you interact with other people," says William Cane, author of The Birth Order Book of Love, since the first people you interacted with were your parents and siblings.
Figuring out your own birth-order personality, and that of your significant other, is simply one strategy you can use to assess your compatibility, adds Catherine Salmon, Ph D, professor of psychology at the University of Redlands in California, and coauthor of the upcoming book, The Myth of the Middle Child.
Oldest females, on the other hand, are more likely to be bossy, confident and aggressive than their younger sisters.
Middles Middle children are the least defined of the types (there can only be one eldest and one baby, but middles shift depending on how many there are in the whole family).
Salmon, if the only has had little experience with the relatively immature, attention-seeking behavior of the baby of the family.
Perhaps no surprise, middles and onlies make a good match, with the middle child accustomed to the needy side as well as the possibly bossy side, of his or her "only" love.
Are you a take-charge firstborn—or the attention-hungry baby of the family?
Relationship Tip: Try to understand that as strongly as you feel about something (like where to go on vacation), that's likely how strongly your partner feels about his choice.
Only Children The stereotype about only children is that they are pampered and precious, and thus will have trouble ceding the spotlight to anyone. The ultimate political power couple, two firstborns, is a classic combination of control, dominance and striving.
Two firstborns often butt heads, says Cane, because both want to be in control of every situation.
However, some middle children (probably for the same reasons as above) can be secretive. Beloved, treasured, and in many cases babied for much longer than their older siblings (and often by their older siblings), the stereotypical youngest of the brood tends to be less responsible and more devil-may-care, with less of a hankering to take charge. In fact, many "grow up" more quickly than kids with sibs, thanks to how much time they spend with adults, says Dr. Wondering how different birth-order pairings typically get along romantically?
"That can be different if the baby of the family came after a gap of more than a few years, though," says Dr. In that case, the baby of the family may act more like an only child or an older sibling—as though the family had started all over again. Read on: Oldest with Oldest Can you say Bill and Hillary Clinton?
Take that into consideration and make compromises to keep the relationship solid.