- Eldest, youngest or middle: Which child has a higher IQ as per science The Times of India
- Why do older siblings earn more? And what does it have to do with allergies? Firstpost
- Earn less than your older sibling? Blame their childhood sniffles ThePrint
- Scientists have found out the reasons for the difference in income between older and younger children in a family life.liga.net
- First-borns do better than younger siblings like me? Makes sense The Times