Whoa! That is a lot of different formula for a bub that little. You need to give a formula at least one week of use to know whether it is the right one for your bub or not. Some babies are just happy chuckers - this is normal and often nothing to worry about. Formula is quite hard on their little tummies and is harder to digest. The Gold formulas are 'richer' than other regular formulas and I always preferred to use a non-gold one. Also, if she doesn't actually have reflux, stay away from the thickened formula because as you have found out, it can block them up. If you want to minimise the vomiting, Don't actively burp her - just gently prop her up over your shoulder or sit her upright on your lap and most of the time the burps will just come. Also try not to move her about too much or 'squish' her up - if you lay her down in a reclined position it will help because she wont be all curled up and placing upward pressure on the sphincter muscle at the top of her stomach. But if she is not visibly worried about wind, don't worry about burping at all, just lay her down and she should be fine. Most importantly, pick one formula and stick with it