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20th October 2015
11:06am BST

The study shows that the eldest child often gets a boost of intelligence due to the fact that they have to teach their younger brothers and sisters.
The report by scientists at the Leipzig University also suggests that the first-born has the edge as they get their parents’ undivided attention at the start.
Awkward.
In fact, a 1.5 drop in IQ levels is estimated to happen per sibling, though if there are only two children in a family, this isn’t always the case.Explore more on these topics: