Every time you have a carrot instead of a cookie, every time you go to the gym instead of going to the movies, that's a costly investment in your health. But how much you want to invest is going to depend on how much longer you expect to live in the future, even if you don't make those investments.

Even if you are planning a birth with an epidural, the evidence suggests that a doula can help make things go much more smoothly.

I've always loved doing research. I remember doing a research project on the Babylonian numeral system in the eighth grade and thinking, 'This is pretty awesome - is this really a job you can have?' This led me toward a career as an academic, although it took me until college to realise that economics was the right field.

The main concern with a very large baby is difficulty in delivery.