Hi Christina K:
Plain Kefir has more strains of probiotics than yogurt; you can usually find it in the yogurt aisle. Kefir has 10 different strains as opposed to yogurt’s typical 3 strains. If you do buy yogurt, read the label to ensure it states it “contains” live active yeast cultures.
I suggest adding anything new to his diet slowly, one at a time, and in small amounts building up to recommended portions. If there are any digestive upsets, this will help you pinpoint any possible culprits a little more easily.
