Can your position in the family affect your personality?

I have always been interested in this as well, but I have found a few differences....

The firstborn I agree is always the best behaved, and quite intelligent, but I have noticed more times than not the second child is usually the most outspoken and rebellious one. Which is the complete opposite of what you have so I am probably completely wrong!!!

The third is often the more easy going and affectionate one.

I have no idea if this has any merit whatsoever, but I do find it very interesting.

I do think birth order has affect on some behaviours such as dealing with others and attention-seeking habits, but most personality traits are inbuilt!