Traveling on airplanes with toddlers or babies can be a challenge.
Each airline has its own rules regarding wee ones, so check when you make your reservation.
As a general rule, infants under two who do not occupy a seat (called a "lap child" in airline terms) qualify for reduced fares and can occasionally fly for free.
For safety, however, the Federal Aviation Administration (FAA) suggests using safety seats for children under 40 pounds.
US airlines allow FAA-approved child seats, but generally require that you buy a ticket since the safety seat will have to be strapped into a regular airplane seat.
Another option is to request a bulkhead seat and a free-standing bassinet.
While you will have to hold the baby or use an infant seat during takeoff and landing, the bassinet and baby can be placed at your feet during the flight.