How to stop breastfeeding him

This is really2 sad and tough work to do. I really really dont know how exactly to stop him from getting milk from me. It is been 1 year and 5 month and I think this is the time for him to stop breastfeeding.
1st method: I use peria.He dont care and keep sucking.
2nd time: I use 'daun bismillah'. Daun ni pahit sangat,people use it to cure/control high blood pressure by boil it and drink the water.At first boleh nampak muka dia tak tahan pahit,tapi keep sucking then buat tak tau je.

brrrrrrrrrr..............letihnya!!