Has anyone heard of this theory? https://www.breastfeed.com/articles...asional-bottle-of-formula-has-its-risks-3451/ Interesting but I don't quite understand it, it states that just one bottle of formula can sensitise babies who may be allergic to cows milk protein. However isn't this protein also present in breast milk if the mother consumes dairy products? Also will a baby that is given breastmilk solely for 6 months maintain a virgin gut if any medications are given e.g. for infacol etc for wind.