Yin , Labbit,
Acutally, if you bf, there is no way to measure how much bb drank. It is feed on demand. If you are totally on bf, it is actually very convenient, you no need to bring bottles, milk powder, thermo flask ,etc when go out.
The milk is always ready.
But ladies, must remember it is not that easy in the beginning, but once you jump over the hurdle, your success is there.
Read today paper, mind and body, they interviewed some mothers who wanted to bf and was so stressed over it.