It has been established that first-born children are the most intelligent of their siblings. This was first proclaimed by a study at Leipzig University, Germany.

The study which analysed the findings of three national studies involving over 20,000 people, found that first-born children are the smartest of their siblings. And, that each successive sibling tends to be slightly less smart.

While the German researchers couldn’t authenticate why elder siblings are more intelligent than their younger ones, the intelligent guess was that first-born children do receive undivided attention from their parents which boost their IQ (Intelligence quotient).

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Also, it was guessed that first-born children gain IQ boost from having to watch, teach and coach their younger siblings.

One of the Researchers, Dr Julia Rohrer commented thus: “One theory is that following children dilute the resources of their parents.

“While the firstborn gets full parental attention, at least for some months or years, late-borns will have to share from the beginning.

“Another possible factor is described by the tutoring hypothesis: A firstborn can tutor their younger siblings, explaining to them how the world works and so on.

“Teaching other people has high cognitive demands – the children need to recall their own knowledge, structure it and think of a good way to explain it to younger siblings, which could provide a boost to intelligence for some firstborns,” Dr Rohrer explained.

Now, a new research at the University of Edinburgh, Scotland has again, asserted that first-born children are most likely to be the most intelligent among their siblings.

The University of Edinburgh research found that first-born children have a higher IQ test score than their siblings as early as age one. Again, it was hypothesised that one of the possible reasons is the receiving of mental stimulation from parents which helps the development of thinking skills in the early years of their lives.

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Wiredbugs gathered that the research was carried out in partnership with Analysis Group and the University of Sydney. The researchers essentially studied data of US children. About 5,000 children were monitored from pre-birth to 14 years old.

The kids’ reading and picture vocabulary were examined every two years. While the examination generally observed their reading ability, the findings as published in the Journal of Human Resources specified that parents give less mental stimulation to younger siblings.

However, first-borns enjoy the mental stimulation just from when they were birthed to three years of age. Parents do withdraw their attention from the first-borns once another baby arrives.