No Go on the Powdered Formula

Mike and I decided on Thursday night we were going to try and reintroduce Lily to powdered formula.  I mixed every 6oz bottle with 2oz powdered formula, 4oz ready made.  I mean - how could only 2oz of powder upset her stomach right?  WRONG!  The projectile vomiting started first thing Saturday morning and continued nearly every feeding until Sunday morning when I refused to give her anymore.  In addition to the projectile vomiting, she was fussy all of Saturday - crying and screaming most of the afternoon.  Since we stopped with the powder mixture Sunday morning, she's back to her smiley self.  It baffles me that the smallest amount of powder can have this great of an effect on her.  I think we've learned our lesson.  Sorry Lily - we don't have any money for college because your diet is too expensive.