So just had the worst experience with Gerber's Good Start formula. I bought it because I got a coupon for $32 off a canister of it from Gerber in the mail. So not only was it free, I actually got $4 extra for getting it. We had previously used Similac Pro Advance for two cans worth (since my LO was born). I didn't expect too much of a difference, but omg. He started having completely solid poops that seemed painful, having an even harder time passing gas and burping, wasn't falling asleep after eating, stopped sleeping his usual 3-4 straight at night, and started crying all day (inconsolable and to the point of me beginning to worry if he was colicky when he definitely wasn't before). This was after only 3 days of Gerber's formula. We bought Similac again this afternoon and he's already sleeping for a couple hours now. Lesson learned- formula brands totally make a difference, and though I love plenty of Gerber's other products, definitely be careful if you're considering trying out their Good Start formula. 😑