Michael, I am a health professional working in early childhood, from infancy onwards. I read a while ago a study about pacifiers (dummies). Infants whose parents sucked the pacifier and placed it in the baby’s mouth had fewer allergies in later childhood. I’m wondering if anyone has done any poo studies to see if that affect heirloom flora in the gut. As an amateur anthropologist and traveller, I have also noted that in cultures where mothers premasticate food for infants there is little eczema and allergy. Has anyone looked into these two practices as a historic means of transferring heirloom flora? Just some thoughts of mine. Cheers.