Gosh my DD must be a greedy guts. She was drinking 210mls at 3 and a half months.

I know what you mean about the Karicare being revolting - taste and smell-wise I couldn't stand it. My DD is on Nan and we've had no problems with it. She's chucks quite a bit but not enough that I am alarmed about it. She always was chucky though. The Nan tastes and smells much better than Karicare and S-26, I think.

A couple of simple things I would try if you aren't already...move him up to a faster flow teat; burp him half way through the feed; keep him upright for a while after the feed; don't try and feed him any more of the bottle if he seems to have had enough (I know you probably aren't doing this but it is worth mentioning. I always follow DD's lead and if she only wants half a bottle sometimes, that's fine). I also would try a plain, non-gold formula such as Heinz (my MCHN likes Heinz and Nan).

Is your DS a snuffly type of baby? DD is and we notice she chucks up a lot more when she has nasal congestion. We have to wash her nose out with saline when that happens and then she can feed and suck on her dummy better, poor little thing. The GP says as her face grows she should grow out of this...she does have quite a small nose. This is not formula-related though, she's been prone to enormous boogers since she was born.

I changed to Mam Ultivent bottles after I researched the BPA issue and DD had a lot less wind after the change of bottle. It had all these claims on the box but I didn't pay any attention to it, I was only interested in the BPA-free angle. But perhaps there was something in it...?

I think the poos sound fine, btw.

Hopefully there is something in there that helps!

ETA: Just remembered DD's chucking also calmed down (as well as general wind) when I moved her up to a medium flow teat...same time as the new bottles, so maybe it was just the teat. I have to admit I'm a bit of a fan of just trying a faster flow teat, I've seen it work quite a few times, especially with bigger babies. And my DD is a big baby like yours, 7.5kgs at 4 months and very tall along with it.