When should i stop breastfeeding?

Allowing the baby to naturally wean is the best time to stop. Forget what other people say. If they are making comments about you nursing a 2 year old then they have not had enough education about the benefits of extended nursing. Ignore them. If they told you to rub whiskey on his gums for teething you would ignore that advise. You are doing the best thing you can for both you and your son.