Among non-twin births, males are slightly (about 5 per cent) more common than females.
In the US, 105 non-twin males are born for each 100 non-twin females.
However, males are slightly more likely than females to die in the womb.
And because the death rate in the womb is higher for twins than for singleton
births, female twins are more common than male twins.1
In conclusion, female twins are more common than male twins.
Dr. Nicolas Kioumji
Pediatric
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