Step-By-Step Guide: Adding A Baby Under 2 To An Existing American Flight

Category: Travel | Author: okeyardtravel | Published: October 1, 2025

Want to travel with a baby but forgot to add them during the booking? Then don’t worry. American Airlines allows passengers to add a baby even after the booking is complete. Online and offline facilities are available for this process. However, before proceeding, make yourself familiar with the rules imposed by the airline for carrying a baby on the flight. 

The infant policy outlines rules for babies, which it is important to check before proceeding with “American add lap infant to existing reservation.” However, it’s important to keep in mind that only babies under two are allowed to be held on a lap. Let’s understand thoroughly.

Rules Covered In American Airlines Infant Policy

If you are traveling with a young baby who is under two years old, then it is a must to follow the infant policy created by American Airlines:

  • The eligibility criteria for adding the baby as a lap child are that the baby is under two years old. 
  • Only one baby is allowed to be held on the lap of a single adult passenger.
  • An American add lap infant to existing reservation can be made via the official website or by contacting the airline directly at 800-433-7300. Alternatively, call +1-800-633-0441 for a quick response from a travel expert. 
  • Traveling solo with more than one lap child requires the booking of a new seat where a car seat can be installed. 
  • American Airlines allows a two-day-old baby to board a flight, but the baby needs a fit-to-fly certificate to ensure that it is fit and healthy enough to travel on a plane.
  • An American add lap infant to existing reservation can be made on both domestic (at no additional cost) and international flights (at a reduced airfare).
  • It is suggested to carry a birth certificate for age verification.

Noted: To add babies under seven days old, it is required to contact American Airlines Reservations directly whether the flight is booked for domestic or international travel.

 

What Documents Are Required For American International Traveling With Baby?

Whether it’s American Airlines or any other airline, documents are a must for traveling, especially when the ticket is booked for international travel, even for lap babies. From boarding the flight to entering the destination country, documents play a vital role in making the travel smooth and hassle-free. These are also needed for the process of American add lap infant to existing reservation.

Here are the documents required to submit and carry:

  • A valid passport book.
  • A visa is required for entry into the destination country.
  • A fit-to-fly certificate for babies under seven days old.
  • If a parent is traveling solo with a lap baby, they need a signed consent letter from a non-traveling parent.

These are some of the documents required to travel on American international flights with young babies (Under 2). 

Can I Call For American To Add Lap Infant To Existing Reservation?

An American add lap infant to existing reservation process can be made by directly contacting the airline at their customer service number 800-433-7300. If this line is occupied or busy, call the consolidation desk at +1-800-633-0441. Assistance will be provided to you regarding adding the baby. However, keep your booking details and documents with you. And, a reduced airfare needed to be paid for international traveling with a lap infant. Hence, before approaching the representative, keep all things with you. 

Conclusion

American Airlines allows young passengers (under two) to travel on flights. However, they need to be added during the reservation. If that has not happened, passengers can request to add a baby to an existing reservation by contacting them directly at 800-433-7300. A travel expert can explain details such as how to add the baby after the reservation, what the infant policy is, or how American Airlines ticket cancellation works by calling +1-800-633-0441.