I really liked the final comments in:
That Elusive Birth Order Effect and What it Means for You
Can birth order really shape your personality?
"The moral of the story for parents is to look for your own biases and stereotypes about birth order as you think about what your children are capable of doing. Encourage them to teach each other, to define their own identities in the family, and to avoid labeling themselves based on their birth order. Don’t let the lives of your children be dominated by the random forces that caused them to be born when they were."
How does this reflect your childhood and birth order? Does it ring true?