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
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.
Flawed - Having weaknesses or problems.
Psychologist - Someone who studies the mind, emotions and behaviour.
Destiny - The idea that everything that happens in the future is already decided and cannot be changed.