Https://intercom.help/infanthelp/en/articles/11538559-traveling-with-a-baby-here-s-how-to-add-a-lap-infant-to-a-united-ticket https://intercom.help/infanthelp/en/articles/11538559-traveling-with-a-baby-here-s-how-to-add-a-lap-infant-to-a-united-ticket