Reading this thread makes me want to borrow a couple of screaming toddlers and book a CX flight in J or F.

Good Grief. A FlyerTalker posts a simple question - whether the kid will be allowed in J at all and, if so, how many miles it will cost. Instead of responding on-topic, many posters attempt to dissuade the member from sitting in the premium cabin or bringing the child along on the trip at all.