Partial savings formula: pumps per day × oz per session × cost per oz
Monthly savings ≈ daily oz from breast milk × 30 × cost per oz
At ~$0.20/oz and standard formula pricing:
10 oz/day from breast milk → ~$60/month saved
20 oz/day → ~$120/month saved
Full baseline: how much money does pumping save on formula.
Example scenarios (1 pump/day, 2 pumps/day, maintenance only)
Nursing + 1 maintenance pump (4 oz): ~$24/month formula avoided from that pump alone, plus whatever baby nurses directly (not counted in pump output).
Nursing + 2 pumps (8 oz total): ~$48/month from pumped ounces.
Bottle combo: 15 oz breast milk + 15 oz formula daily: ~$90/month saved vs full formula.
Weekend pump-only, formula weekdays: savings scale to days and ounces breast milk covers. Two days at 25 oz breast milk saves ~$10 that week vs full formula.
Schedule help: breastfeeding and pumping schedule.
Ready to simplify your pumping schedule?
Track sessions and your freezer stash with Stash on iOS.
When combo feeding still beats full formula financially
Even one daily pump through 6 months saves ~$360 gross on formula. That often exceeds extra bags and a shared pump cost.
Combo feeding uses fewer supplies than EP. Net savings per ounce replaced can be higher than EP because your monthly bag spend is lower.
If combo is sustainable for 12 months at 50% replacement, gross savings land around $900 to $1,100.
Motivation angle: every ounce replaced still counts
Combo moms sometimes skip pumps because formula is right there. Dollar math can reframe: that 4 oz session is not pointless, it is ~$0.80 today and ~$24 this month.
Mindset: combo feeding motivation.
Track partial totals in Stash on iOS. Session log shows cumulative output and savings vs full formula.
