Danone do a baby fromage frais to be used from 4mo, is there any difference to what you are using?
If there's been no reaction i would saty with it, I know babies that are allergic to oats, so no porridge, or wheat, so no toast, or dairy, so no yoghurts!! So if he's fine, carry on, he could be allergic to the other suggestions! esp if MIL/HV recommended it.