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Regardless of whether or not they pay a percentage of the fare, infants (less than two years of age) are allowed the following(*):
*Additionally, in both cases you are allowed to bring a foldable carriage, a small portacrib or a carseat.
Infants paying the full First Class or Business Class fare have the same luggage exemptions as an adult passenger traveling in these cabins.
IMPORTANT: in both cases, the foldable carriage, small portacrib or carseat being allowed in the cabin is subject to the space available.