From "select cities to Dubai"...

Sure, I'm sure it's:

Kids go for free, if they're infants who sit on a lap.
Kids go for free, you just pay the taxes.
Kids go for free, if you start your trip from Bahrain, Muscat, any city in Zimbabwe, or Izmir, Turkey.
Kids go for free, to a limit of 2 kids.
Kids go for free, if they're under 3 years old.

...