Hello - I'm 30 wks pregnant with my first baby and stocking the nursery. I've read a lot about FHS (there was an article about it in this month's M&B magazine) and special pillows you can get that are supposed to help prevent it. But then other advice says not to use anything in the crib/cot (although I assume these pillows are safer than a normal pillow). Are they worth it/safe, or a waste of money?