I totally agree...taking a small child to any big event like that would be very UNchildfriendly in my view.
In places that put themselves out to be child friendly it should mean finding ways to make the place somewhere that provides care for children and/or activities to keep them occupied etc. I don't see how that could mean allowing babies into huge events for free.
I think the original post was to do with charging parents for a ticket for a baby whether they used a seat or not.
A sort of similar situation is expecting a single fare on a plane for people who need two seats because they can't fit in a single one and then complaining when you are charged for two seats.