I found it interesting that finally it was put out there that children naturally lose that ability to suck for a bf. Doesn't that tell you something about when nature intended children to be bf to? My DD weaned herself at four. The average the WHO says is between two and five years. I can see how some children who are more attached and interested would last to 7 or 8. And I love that they remember the feeding and the taste of the milk - all that effort on Mum's part and you get some appreciation in the end!