Also, for babies you need to research dosages for those vitamins. Vit C and D are fine, because the body will only use as much as it needs and process the rest out. I've had toddlers munch as many as 10000 mg in one day, with no ill effect except for runny poos. Zinc, however can make one nauseous if overdosed. However, check medical white papers for dhild-dosage, not FDA recommendations, which are 10X too low in most cases. Quercetin is a bioflavenoid, commonly found in apple peels and onions. Should be fine.