Please, leave those screamers at home
MY wife and I recently made a trip with British Airways from L.A. to London. On both flights, we had to listen to screaming babies and toddlers for many hours. I can think of no unselfish reason for a parent to take a child under 4 years old onto an aircraft.
British Airways has three flights per day to London, and perhaps they and other airlines could consider making the minimum age 4 years for one of those flights.