enigma - I posted in the bottlefeeding area too. Ryan seems to get constipated. He was constipated when we first started the S26 as 100% of his diet (I couldn't keep up with demand) and then he started throwing up (but was regular by this time) so it was recommended we try SMA which made his poos like fish tank gravel and there was blood on a couple So now we're back to the S26. I'd rather him throw up occaisionally (and not seem bothered by it) than have him crying in distress from being blocked up! Just wondering if you've had the same kind of problems and what formula was recommended to you & why....