Infants under 2 years old can travel on your lap for free or at a reduced fare on domestic flights. For international flights, infants typically require a ticket. Select "infant" when booking and provide the baby's birth date.
If your child is above 2 years old, you must select "child" instead. For roundtrip bookings where your infant will turn 2 during the trip (infant at outbound, child at inbound), book separate one-way tickets and select the appropriate passenger type for each leg.