Birth Order Theory suggests that a person's position among their siblings can influence their personality traits and behaviors. For example, firstborns are often seen as responsible and achievement-oriented, while middle children may develop strong negotiation skills and a sense of fairness. Youngest children are frequently described as more carefree and social, as they often receive more attention from their parents. This theory was popularized by psychologist Alfred Adler, who believed that family dynamics play a crucial role in shaping individual characteristics. While some studies support these ideas, others argue that factors like parenting style and environment also significantly impact personality development.