We thought about that and figured it wasn't really necessary (for us). I think it would need to be a new model, which could be used to track the status of pumped milk (and may well be super helpful, particularly later on) but UX wise that would introduce a bit of complication with the feeding entry process. It's certainly doable, just not something my wife prioritized. Right now she just pumps when she feels full and baby isn't ready to eat. Then I get to do the night feeding and record it as a bottle feeding with Xoz of breast milk (: