Hellobee Boards

I think it takes at least a few days to tell if its the formula thats causing the issue or not. We started out with the liquid formula ( pre-mixed) because we got a lot of it from the hospital. Its really convenient. After that we did gentleease which she was ok with, we then tried regular enfamil and realized she didint like it much and was quite gassy so we switched back to gentleease.
I also would have done the transition slower

I am not understanding... So you are mixing formula into breastmilk bottles?

For us we never mix two types of "milk" together..... out of all those breastmilk feedings we'd give him 1 bottle of formula. He didn't take it well at first (he took 1 oz after a long time, then I nursed him and he drank well), but then after a few days he'd take the bottle quickly and more in quantity.

Projectile puking -- you may want to call your pediatrician though as that could be a sign of allergy - maybe she is allergic to cow's milk or something? (some formulas are cow's milk based)

Honestly I think she just needs more time on it. I remember when I had to supplement at the bathing, LO would vomit it all for the first day or two but then got used to it.
By the way: just to clarify...you're making formula and mixing it with water,right? Then pouring it into the breastmilk?