Keep pumping, it helps. Establishing supply can be tricky, especially when you're supplementing. Remember breastfeeding doesn't have to be all or nothing, any amount of breast milk you can give is beneficial. If you're only getting a few drops pumping, I might try alternating pumping with hand expressing- the first few days my son got colostrum and milk by syringe in addition to nursing and formula supplements.
You're doing a good job, Mama. :)
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