I am sorry but I just don't believe in either thing. Am I the only one who thinks they are just useful terms to apply to unsettled baby behaviour and unexplained screaming? Believe me both mine were screamy babies but as far as I could tell they just needed comfort, feeding or sleep. I just find it hard to believe that the burping and farting that us adults manage perfectly happily most of the time should cause so much trouble for babies. I also don't remember having any pain at all as a child with my grown up teeth coming through so how come the first should hurt so much? Is it just grandparent 'lore' and an excuse to market a vast array of over the counter cures?