When traveling with an infant for an extended period and the return date is past the infant`s second birthday (he/she exceeds the age limit for infants by the time of the return flight) you should book the segments separately. The outbound will be booked for adult and infant on a booking code, and the inbound will be booked for adult and child on a different reservation.
If you already booked roundtrip for an infant and extended your trip with date change, past the child`s second birthday, you should contact our Customer Support team to book a child ticket. A credit will be issued for the infant fee, and you will be able to use it a partial payment for the new child ticket.