If it doesn't bother the baby, it's fine. For some babies, caffeine can be a trigger for upset tummy but in general, there is such a minute amount that passes through the milk that it is inconsequential. Most medicine is the same way. . .
And yes, I drank 4-6 cups of coffee in the morning and then about 2 liters of Pepsi throughout the day at the beginning to stay awake.
