The Sonogram.

     Did you know the first sonogram is going to be...invasive? That's the only way I know how to describe it. Something called a wand is used. When you hear wand, go ahead and think Harry Potter. But as the baby grows and the lining around the uterus is stretched thinner, they'll be able to do it through the skin and it's a lot less invasive. If you get a good obstetrician, they might throw you a few extra sonograms. If they do, you'll be able to see your baby's (or babies, if you're lucky enough to have multiples) bones develop. Actually, when they're born, it's mostly just cartilage, but bones none the less.
     I'm lucky enough to be having Dark Helmet. The sonogram clearly showed my child's head to be about 90% of its total body weight. I'm having Dark Helmet.