It's a really, really tough call hun. ((hugs))!! Have you talked to Michelle at all? (deckcheriot) - I know they had lots of trouble w/ Katie's digestion at first too and was very strongly pressured by her ped. to give up bf'ing. It's my understanding that she was able to stick with it... but I don't know her whole story.
Back on topic, Culturelle... hum.. I do remember reading about them, but I can't remember why I didn't go with that brand. I'll do a quick google. Right, I remember, Mannitol - it's a diuretic.
You don't need to bog yourself down with particulars so don't bother reading the link, but if others are following, this is what wikkipedia says about Mannitol
http://en.wikipedia.org/wiki/MannitolI know. This S.U.C.K.S.!!! It's taken me months to find the right probiotic for Arthur. I know I mentioned Biogaia to you. Well, after trying Arthur on it for a week, he started to get constipated again. In comparing it to the other Probiotic we were using with a lot of success (Klaire Labs), Biogaia doesn't even half half the amount of probiotic cultures Klaire Labs does - so I believe Arthur really needs the higher potency. I've started him back on Klaire Labs Infant Probiotic and he's not constipated anymore. Go figure. I'm actually going to order more tonight.
Just as an aside, I know you are really trying hard to stick to RPAH diet - are you keeping up your fats? Babies REALLY need that good fat from Mama milk. For the short time I did a low Sal diet I made sure I ate Salmon every single day. And even though they aren't considered the "best" fats, I did sneak in Canola, Sunflower and Safflower oil whereever I could. TBH, the lack of good nutrients and fats was my main reason for switching to GAPS. But I know many have had success w/ RPAH.
Also, if you are sticking with the low Sals, have you tried making your own chicken broth? So - boiling chicken bones (preferably organic) for approx 2.5-3hrs - and leaving in ALL the fat that accumulates. That fat is essential for good intestinal health believe it or not, and although Henry won't be getting it directly, the fats will go into your BM. Chicken broth would be low Sal, esp. if you were making it yourself. I know you are probably bogged down with info, but the Nourishing Traditions cookbook we talk about on the RPAH thread has all the info about it (and GAPS believes this principle as well).
I wish I knew what else to suggest. Keep at the probiotics. Esp. if you have to go to FF. In this situation, they are essential regardless if you are BF'ing or FF (IMO). Just stick to what you believe. If you want to BF, I believe there's ways to making it work. Have you contacted your local LLL leader? Ours here is a tremendous source of support and advice. I know many Dr's aren't very well versed in this sort of thing, and it's so, so hard. I've found it so frustrating, but I'm sticking with what I believe, and we are seeing progress, even though its slow. Again, I'm not a Dr. Things still aren't perfect here but they are much, much better. I expect this to take a while, but for us this is what's working. xooxoxoxxoox