I agree with respect to private rooms. I think, however, that the restaurant AND the parents do everyone a disservice when they allow this kind of celebration to proceed in a public dining room. I don't think it is ever appropriate for anyone to disturb other diners. The Chinese handle this kind of thing exactly right -- virtually all restaurants in China, except for the smallest holes-in-the-wall, have multiple private rooms and, usually, the main dining room can be partitioned with floor to ceiling dividers. This allows for noisey parties to be held cheek-by-jowl with intimate dinners and normal family and other social get-togethers without anyone disturbing anyone else.