Adam Finn, a professor of paediatrics at the University of Bristol, agrees that a new strategy is required.

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"Human breast milk is designed to feed human infants and cows' milk is designed to feed baby cows, " says Professor Terence Stephenson, president of the Royal College of Paediatrics and Child Health.

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Professor John Wyatt, of the London's University College Hospital's department of paediatrics and child health, said one of the issues was that the debate was extremely "polarised" with some seeing it as a black or white issue.

BBC: NEWS | Health | Doctors grapple with abortion debate