When ever a parent starts in with what they have read somewhere I ask them for the article - ie proof. Then make sure I have plenty of my own that say something different to show that there is no such thing as a difinitive authority on child rearing just ideas. Rarely do I ever have a child that naps in the AM past 18 months and those are usually the ones that come very early or the parents don't put them to bed till late but it starts early and lasts no more than an hour and then they are gotten up and put down with the rest of the group in the afternoon.