I bottle fed my 1st daughter on S26 gold, however i did experience constipation with her when she was only a few months old but that rectified itself by the time she was 6 months old. I didnt realise that the extra iron in the Gold formula could do this to a baby.
I tried my 2nd daughter on it when she was 5 months old as i had run out of breast milk and she refused it. I then tried her on Nan and she didnt like that either, in the end she took Heinz Nurture Gold.
So i guess what im saying is that every baby is different. If you can get onto the individual websites and request sample packs you can then find out which your bub prefers. I know that S26 self boxes of 6 sachets at the supermarket, otherwise check with your local chemists.
I am currently still BFing my 3rd and hoping not to put her on formula but if it comes down to it i would not be surprised if she didnt like either of those taken by my firs two daughters.
Good luck with it!
Rand Hupper
Baby Clothes