Even though I have one of my own now, I still try to avoid the "lift and sniff" nappy check technique. If I do it, I try to be very subtle about it. It's always made me uncomfortable, don't really know why. Also the public "I don't have to go anywhere to change this really rotten nappy. I'll just do it here while you eat your scone," school of thought. I always go away somewhere, not because my child's nappies are horrid, (they're not, they smell like Angel Delight) but because I think it's more dignified for the baby. Babies deserve some privacy, no? My two SILs do both of these things all the time and I'm silently judgey, but they have six kids between them so maybe IABU?