That is something critics of high skill immigration have supported, since it would encourage foreign-born professionals to change employers the same as U.S. workers.

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After being born a boy, she became the first Briton to undergo a sex change operation, in Casablanca in 1960.

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Those in favour of a change said babies born at 24 weeks were increasingly likely to survive, and it should therefore not be permitted to abort pregnancies at this stage.

BBC: Q&A: Abortion law

Exactly how the fish "imprint" the magnetic field near where they were born is unknown, but the scientists believe the change from fresh to saltwater triggers some kind of neurological process.

BBC: Sockeye salmon 'sense magnetic field of home'

However, a small percentage of people are born with a single-letter change in their DNA for this enzyme that causes the codeine-to-morphine reaction go faster.

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The change has been so rapid that almost half of those born abroad arrived in the decade leading up to the 2011 census.

BBC: Census shows rise in foreign-born

Groups who encourage change, Plan says, should be supported, "to ensure that when a child is born she is not discriminated against simply because she is a girl".

BBC: Educating girls is vital to a country's economy, Plan says