I'm 38 weeks pregnant so have just dutifully been to mothercare and bought my nursing bras. They make my (rather more substantial than they used to be) boobs look like lonely satsumas at the bottom of a christmas stocking. I know underwired nursing bras exist but I also have a recollection that they are not a good idea. Why not? I've been wearing underwired bras through pregnancy once I hit D and without them they practically skim the floor.