The current leaflet provided with another brand of the drug, made by Wockhardt, clearly highlights risks to any unborn child including spina bifida, congenital abnormalities and delayed development.

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Catherine Nakielny of the Farmers' Union of Wales animal health and welfare committee chairman said farmers needed to be on the lookout for any unusually high animal abortion cases or congenital abnormalities - deformed lambs, swollen heads or weak lambs.

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Goldenhar Syndrome is a congenital condition that produces abnormalities of the head and the bones of the spinal column.

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