Social drivers are at the heart of this trend.
Articles on Multiple births
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As a clinical psychologist specialising in twins, this is is one of the most frequent questions I am asked.
Semi-identical or sesquizygotic twins occur when two sperm fertilise one egg. A boy and a girl in Brisbane are only the second set of semi-identical twins known in the world.
Are they twins? Are they identical? Are they natural? Which one is older? These are some of the all-too-familiar, somewhat invasive and highly personal questions posed by well-intentioned strangers to…



