Why Ounces Don’t Tell the Whole Story About Milk Supply For many pumping parents, the numbers on the bottle quickly become emotionally charged. A “good” session brings relief. A lower-than-expected session can spiral into worry about supply, adequacy, and whether breastfeeding is failing. But pump output is one of the most misunderstood data points in lactation . While it can provide useful information, it is often over-interpreted — and that misunderstanding fuels unnecessar