https://unitedairlinesoddohelp.helpshift.com/hc/faq/649-how-to-add-an-infant-on-a-american-flight-ticket/
https://unitedairlinesoddohelp.helpshift.com/hc/faq/650-how-to-add-lap-infant-american-after-booking-international/
https://unitedairlinesoddohelp.helpshift.com/hc/faq/651-how-do-i-add-a-lap-infant-to-my-american-flight/
https://unitedairlinesoddohelp.helpshift.com/hc/faq/652-the-easy-way-to-add-an-infant-to-an-award-flight-on-american-most-of-the-time/
https://unitedairlinesoddohelp.helpshift.com/hc/faq/653-can-i-add-a-lap-child-to-an-already-booked-flight-on-american/