Breastfeeding is about so much more than just food intake!That's why it's totally beside the point when people say "Oh, they can drink cow's milk." And, as people have said - cow's milk is meant for baby cows, not humans! So why should I give it to my child, when my own milk has sooooooooooooo much more to offer, and NOT just until six months, but on every single day you breastfeed until the day you stop.
And it really winds me up when people hint that I might be feeding because I need it more than my baby/child ... that is just complete rubbish.
My dd1 weaned herself at 2 years 3 months, and it felt wonderful that she stopped because SHE was ready to stop, not because I made her! She was ready to make that next step away from me, and I was very happy about it - whereas now, with dd2 who's 11 months, I would feel sad to break that bond - the time just isn't right yet.
If you really keep going until 12 months, twiglett, then you might find that you can grow into longterm breastfeeding. I never expected to be doing this either!