The British Medical Journal reports that a study has discovered a link between caffeine levels and smaller babies. The study has prompted the UK Food Standards Agency (FSA) to issue new guidelines to recommending caffeine intake be cut from 300 mg to 200mg per day, - the equivalent of two cups of coffee or four cups of tea.

Ever the tea-drinking nation, the advice comes with a caveat.

"We mustn't forget that tea is an important source of fluid for the British population," said Dr. Carrie Ruxton of the Tea Advisory Panel, who suggests that pregnant women should not cut tea out of their diet altogether. "A cup of tea is 99% water," she said, "and four in ten cups of the nation's daily fluid intake comes from tea. Tea is also high in natural plant antioxidants which are accepted to deliver health benefits. If pregnant women cut out tea without consuming other fluid sources, they might risk dehydration. Or if they switched to soft drinks, sugar intakes could increase."