In popular culture a woman experiencing a pregnancy craving is likely to want something bizarre like a pickle on a donut. Most of us have craved things a little less exotic, like ice-cream or hot chips. Some women go the other extreme and crave dirt or chalk. And then there are the foods we to eat or avoid to stave off morning sickness. What do all these strange cravings and rejections have to do with growing a baby? Hannah Dahlen, Professor of Midwifery at Western Sydney University, takes us through cravings and nausea, what they mean and how we can manage them.