I think one cup of coffee a day in the mornings is going to be ok, especially if bubs seems to be unaffected by it. The decaf process for coffee leaves so many chemicals in the brew that unless it is water filtered it is actually worse for you so I wouldn't use that as an option. Slowly decreasing from 2 cups to 1 and slowly changing to naturally decaf tea would probably be easier. I find that if I miss my coffee I get narky and get a headache so gradual weaning from the caffeine seems to work best (for everyone around me too )