Birth Order and Personality Does being first born make people more responsible? If someone is the middle born child, is he or she going to be rebellious? If people are last born are they more likely to be on television? Are first born children inconsiderate and selfish or highly motivated? A person's birth order can affect his personality. Birth order… definitely affects your personality, your attitude, your children, your occupational choice, and even how well you get along with God (Leman, Birth Order 10). There is an awful lot of research and plain old "law of averages" supporting the affect of birth order on personality. It doesn't explain everything about human behavior--no personality te