when to stop breast feeding?

I don't think there is a "right" answer for that question. Each woman has to decide that on their own and should take into consideration what the baby's doctor has to say.

I have nurse my daughter continuously for two years and one month. My pediatrician says that it is alright to still continue nursing her until that age. But you have to give formula milk to the baby when she's more than a year old as an additional nutrition. I am thankful that I have nurse my baby that long because I think it has contributed so much to our bond. And, she's not very prone on acquiring diseases.