just wandering if anyone has had a problem with...

just wandering if anyone has had a problem with the formula disolving in the water? and also there newborn not taking to it so well? my boy is 2 n a half months and normally i feed him 'S-26 Original' with no probs. I had run out during the night and had no choice but to buy the 'alpha pro' one.... not only dose it have floatys in it... my boy seems to always bring up heaps of milk after almost evry feed. not sure if its connected atall but just wandering if any one else has had problems with the s-26 alpha pro for newborns......?