I stopped breastfeeding C at 13 months old.
It was always my intention to breastfeed until 12 months if possible and then her impending hernia surgery prompted me to continue a little longer.
Being is hospital with a baby is so much more flexible if you are breastfeeding. The "null by mouth" time is reduced, as breast milk is softer on the stomach, meaning you are dealing will a hungry baby for less time. Also the hospital are obliged to feed breastfeeding mothers, which meant no having to dash to the canteen for food.
Finally C turned 13 months in the spring. The bug season was coming to an end and I felt brave enough to let her immune system take over on its own.