A new study has shown first-born children are smarter than their siblings. It is thought to come from having to teach their younger brothers and sisters.
Scientists also suggest that having your parents’ undivided attention means you end up learning more, which benefits the eldest child.
The study’s data came from IQ and personality tests from three national studies, one from the UK, involving more than 20,000 people all together.
Scientists at The Leipzig University who carried out the study estimate a 1.5 drop in IQ points per sibling.