Having taken oil of oregano, I must agree. If nothing else, the oregano flavored burps might give a toddler an aversion. I would try the coconut oil as caed. recommended, and alternate with probiotics, sprinkled on the tongue if the kid doesn't eat dairy. If s/he eats dairy, graduate to hfs yogurt then kefir right away. When shopping for yogurt, look out for inulin. It's a filler the industry touts since it can promote bacteria growth. But if bad bacteria are present, they can feed on the inulin, too.