When pumping breast milk, it is important to know when to stop to avoid over-pumping. Signs indicating it’s time to stop include: breasts feeling soft and empty, milk flow slowing or stopping, and suction becoming less effective. Monitoring pumping time and milk output can also help gauge when to end a pumping session. It’s generally recommended to pump for 10-15 minutes per breast, or until milk flow decreases significantly. If unsure when to stop, consult with a lactation consultant for personalized guidance.