JEnny, how frustrating on the blisters! :-(
The hypoallergenic formulas are supposed to be broken down much more to be safe for those with allergies to milk, soy, and lactose. It is still cow milk based. We stayed on alimentum (a hypoallergenic to around 15 months, as I was terrified to try milk). He was WAY over the 95th percentile for weight, as he did drink a lot of formula. He was at the very high end for daily amts. Prior to going on prevacid, he was drinking way more than the recommended daily amt. He would scream down the house for more formula every 1.5-2.5 hrs (based on needing to drink/swallow to soothe his throat from reflux). I have also heard others mention it passes through the system faster (and that helps with reflux). I am not sure if it would make a difference for helping a lo feel fuller longer? Since we did formula from about a month+ on, I really don't have much comparison.