Iron,
no long no talk, understand your feeling, and i think i will be the same as you, even Moses now is 16 months and he still enjoys mother's milk, but since he just can walk, so i find he is entering another stage , and i miss the dates i can hold him all the time. I think i must cry if one day he does not need mother's milk. however, you should be happy as your son would prefer mother's milk than other.
also, your son is a happy boy and i think he is now enjoying the school life as well as your caring.