There are many things you are told to do, and avoid, when you're pregnant. Some of these things may come to you in an official pamphlet from a health organisation. Others might be explained by a very well-meaning neighbour. Sometimes it's difficult to sort the facts from the fiction. Dr David Addenbrooke is an obstetrician and co-author of 9 months, The Essential Australian Guide to Pregnancy. He explains listeria and whether or not a hot curry will really bring on labour.