My DD just turned a year last week and I was reading in What to Expect the Toddler Years what it says about weaning & when to do it. It lists several reasons you should wean at a year, like that the milk doesn't have nutritional value, the child will become too dependent, it's harder to wean an older child than a 12 month old, even that extended BF may cause health problems. Well, my copy of that book is about 10 years old, so I thought in the newer editions, it would have changed. But I went to the library and looked and the newer edition still lists all those things. It just makes me sad. On the other hand, I think it's becoming more accepted and seen as beneficial by more doctors now. But I guess there's still a long way to go.