I've just asked my wife about carseats and she told me firmly that nowadays most people used them in Japan. She also tend to take such questions very personally and get angry if I criticise Japan. She sometimes says (half-joking, fortunately) that she is going to look for a Japanese husband if I make such comments.

What's funny is how opinions can vary from one person to another. I asked about 20 people if babies/children usually sleep with their parents/mother in Japan, and though 90% said yes, 1 was actually quite convinced that it was an old-fashioned system and that normally children all had their own room and bed nowadays (because she has grown up in such a family). So, I'd rather be careful before saying that Japanese do like this or like that. I always try to ask as many people from as many age, region and background as I can. That's quite easy with my job.