Jeju Air's traveling with infants policy allows infants aged at least seven days on domestic flights and 14 days on international flights. A child under two normally travels on a guardian's lap without a separate seat; the published infant fare is free domestically and 10% of the adult fare internationally for lap infants. To use an approved child safety seat, purchase a separate seat, provide your own certified restraint and contact the airline at least 48 hours before departure. The seat must face forward and meet dimensions of 43 × 38 × 70cm maximum plus certification conditions. When one adult accompanies two infants, one is assigned a child-fare seat. Stroller check-in is free. Ask about available seat-group allocations and exact fare conditions before booking.