so i'm booking a vacation package through travelocity. the price is the same whether i add the lap child or not; and this is for business class tickets. so my first inclination was not add the lap child but to call the airline directly and add him once he is born but i know that i will have to pay taxes on him. and like i said the price on travelocity is the exact same with and without him, so can i simply add him with todays date and then call the airline to change his birthdate? the issue is that this ticket also includes travel on 3 different airlines (united, swiss, and lufthanasa)