Is being the youngest best? For decades, scientists have debated whether birth order shapes who we are. A new study offers major insights — but many experts remain unconvinced.
Birth order DOES matter, say scientists
Sibling rivalry: A new study involving 10 million people explores whether birth order truly shapes our health and personality. Glossary
Neurodevelopmental - The way the brain grows and changes as a person gets older, affecting how they think, learn, and behave.
Autism - A condition characterised by difficulty in social interaction and communication. According to the World Health Organisation, 1 in 160 children has an autism disorder.
Migraines - Very painful, severe headaches that can also make a person feel sick or sensitive to bright lights and loud sounds.
Shingles - An infection that causes a painful rash.
Psychotherapist - Someone who treats emotional problems and mental health issues. There are over 1,000 types of psychotherapy.
Sceptical - To have doubts or reservations. The philosophical theory of scepticism holds that some knowledge is impossible.
Cherry Picking - When someone only chooses the facts or examples that support their own idea while ignoring the information that proves them wrong.