Now siblings really can blame parents for a firstborn's edge
Does birth order really matter? It seems so. Researchers have often told us that first-born children are the most likely to succeed, but a new study has revealed that firstborn girls are statistically more likely to be the most motivated and highly qualified of their family.
Not only that, but firstborn girls are 13pc more ambitious than firstborn boys.
Sheryl Sandberg, JK Rowling, Hillary Clinton, Angela Merkel ... the list of successful firstborn women is endless. Eldest boys haven't done too badly either with all 12 men who have walked on the moon being either the eldest or only child.