Sally Peabody gives a great tip on her blog http://peabodysparis.blogspot.com :
If you are visiting Paris with children 12 or under, or, are shopping for kids or grandkids for fashion or accessories with that ineffable French ‘touch’, the new Bonton flagship store in the upper Marais will be a trove of temptations. Bonton is the ‘little brother’ of Bonpoint, the well known luxury French children’s clothing firm. Bonton spreads its wares over three architect designed floors. While adults shop for children’s clothing, homewares, accessories and furniture, kids can watch movies, get their hair cut in an old-fashioned barber shop, eat cupcakes or curl up in the library area with a good book. Brilliant concept and beautiful things!