My DD never did well with the gold brands. She used to get terrible constipation- On S26 gold and another gold one (can't remember now) we switched her to Nan Ha and she was great. We just switched her straight over as we figured she was already badly constipated from the Gold stuff so we couldn't muck her up by switching. She stayed on that until 6 months and moved to Heinz which I am currently in the process of replacing with cows milk.