DD used SMA as S26 was not filling her up, so we got a thicker based formula ...

This was almost 10 yrs ago now, and can't remember too much info on SMA (as in lactose intolerance etc)

HTH
You can still get SMA from Woolies. It says that it specifically keeps tummies fuller for longer. It's because it contains more of a different type of protein which takes longer to digest.

I'm finding heinz Nurture is good for DS.