Babies: 6 - 9 Months

Advice needed on introducing formula

For 6+ months I EBF, but I am having to drop a pumping session or two because of work and will need to supplement.  I have tried Earth's Best, Similac Advance, Enfamil Premium, and now Similac Sensitive and they all seem to hurt her tummy (except Enfamil which made her projectile vomit). I am only giving her 1-2 oz of formula with 5-6 oz of expressed milk for each of her feedings.  I know formula is rough on tummies, but is this normal?  I have not tried each of the formulas for more than a couple days because I hate to see her miserable so maybe I am switching too quickly? Any advice would be appreciated.
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