All my boys were born vaginaly.
DS 1 selectively vaxed
DS 2 even more selectively vaxed
has no allergies asthma or excema.
DS 3 unvaxed
has seasonal asthma, excema, and is allergic to soy, corn, peanuts, cow dairy, and gluten.
DS 3 was born VERY rapidly (read; less than 30 seconds in the birth canal) I have wondered if perhaps his gut was not properly colonized as a result.