The birth order is the order in which a child is born. The first child is normally the oldest child that is born into a family. So the children even though they are the forth and fifth child their birth order is thus first born and last born.

What is the theory of birth order?

A researcher named Alfred Adler developed birth order theory in the 20th century. The theory claims that the order in which a child is born shapes their development and personality. Adler also claimed that family, community, and social aspects play a major role in shaping a childs personality.

Does birth order make a difference?

Damians study also found that on average, firstborns enjoy a small IQ advantage over their younger siblings. Those born first also tend to complete their education with a higher degree and opt for traditionally prestigious careers, such as medicine or engineering.