I posed the original question regarding infants - not children. I think infants are classed as less than 2 years old and usually travel free when accompanied by a guardian. Is it not, therefore, rather ironic that a pax ( the infant ) who is paying the least fare ( £0 )on the aircraft is, if being uncontrollably noisy, causing the greatest nuisance to those who are paying amongst the highest fares.
If airlines insist on permitting infants in 'business' or first class then perhaps it is time to rename the various compartments of the aircraft to reflect the fact that they may not be suitable for either business or rest and thus may not provide the luxury they advertise.