Ever since our baby’s first cold, I’ve been routinely giving her a small amount of healthy bacteria (aka pro-biotics). When I first gave it to her, it knocked out the cold immediately. Since then I’ve been using it for prevention and also to help her immune system deal with vaccinations. Vaccinations have been a complete non-issue for her–she never gets sick and has never had a fever. I take a capsule and put about 1/3 of it in her food.