Birth order has a powerful effect on children's emotional development, on their self-esteem, and on their sense of well-being. The youngest child, the firstborn, the middleborn, twins, and the only child all have specific birth order issues that, if not atted to early on, can impair their functioning and their interpersonal relations at home and at school, and can follow them into adulthood. Parental birth order, too, plays an important role, as do such other factors as gender and family size. To understand these birth order blues, the author, an expert in parent-child relationships, first raises parents' awareness of the impact of birth order upon children. She then shows how to identify their children's birth order problems, often disguised by behaviors such as underachievement or aggression, and suggests how they can resolve these issues and prevent negative behavioral patterns from developing.