Haven't tried Bellamy's sorry, but my DS did have NAN HA Gold. We never had any problems with it. He didn't get constipated and the smell of the formula was not as strong as some of the others. I only found out later that HA stood for Hypo Allergenic and we could have just used NAN but by that time he was 10mths old and we didn't want to change.

Hope this helps.

Hansie