Https://intercom.help/infanthelp/en/articles/11848646-step-by-step-how-to-add-a-lap-infant-to-your-already-booked-allegiant-flight https://intercom.help/infanthelp/en/articles/11848646-step-by-step-how-to-add-a-lap-infant-to-your-already-booked-allegiant-flight