"Eldest daughter syndrome" is a term used to describe the extra responsibilities, unique challenges and expectations that eldest daughters may face to being the perfect role model for their siblings and also to share some of the parental responsibilities. It's not a mental health diagnosis, but an impact that may affect a daughter's personality and life experiences.
The responsibilities can include taking on more household chores, caring for younger siblings, being a role model, being emotionally strong, maturity to adjust and care for the younger sibling, share parents’ responsibilities, have better sense (supposed to) of judgement to name a few. Though the responsibilities can nurture leadership qualities, independence, it can also lead to added pressure and a quest for perfection.
