Since the 1960s, a lot of research has been conducted on Adler’s fertility theory and middle-aged children, but many of them are contradictory.
When considering why middle-aged children are like this, a comprehensive book written by two therapists is called Middle Generation Syndrome Point out: “If there are only three children, then the first one will be the older child and the youngest is the baby. The middle child may be excluded […] The closer the child is, Parents may have less energy The effort has exacerbated the problem. “
And there are some studies that show that birth order may affect personality and mental health: for example, after analyzing 404 children, a paper published in 1988 Journal of Genetic Psychology Studies have found that compared with middle and young children, the eldest son is less likely to suffer from depression and anxiety. They also tend to report higher self-esteem.
However, for every study that found that birth order features are legitimate, there is a conclusion that it is not the case.
A paper published in 2015 Check the impact of birth order on personalityPointed out, “We always find that the birth order is extroverted, emotionally stable, and agreeable, due diligence or imagination has no effect […] We must conclude that the order of birth will not have a lasting effect on a wide range of personality traits outside the domain of knowledge. “
In response to this study, another study boldly titled Resolve debates about birth order and personality The conclusion is: “The birth order has almost no substantial relationship with the development of personality traits, but it has little to do with the development of intelligence.”
Therefore, middle-aged childhood syndrome may not become a true medical diagnosis anytime soon. But this is not to say that middle-aged children cannot be related to the common characteristics of “middle-aged child syndrome”, nor can they benefit from paying attention to them. Here is some background knowledge about what they are and how to use them to benefit you.