Firstborns Lisette Schuitemaker and Wies Enthoven set out to discover the big five qualities that characterize all eldest daughters to some degree. Eldest daughters are responsible, dutiful, thoughtful, expeditious and caring. Firstborns are more intelligent than their siblings, more proficient verbally and more motivated to perform. Yet at the same time they seriously doubt that they are good enough.The Eldest Daughter Effect shows how firstborn girls become who they are and offers insights that can give them more freedom to move. Parents with a firstborn daughter will gather invaluable tips on how to raise their eldest daughter and her siblings.