How Can I Add My Lap Child On Allegiant Air Flight?

[restaurant-player]

Hi there! I have booked a flight ticket with Allegiant Air, but forgot to add my baby. Is there any chance that I can add him as a lap infant after the booking? Is there anyone who knows or understands the Allegiant Air lap child policy, or has gone through a similar situation? Please guide me through the process. Your suggestions will matter a lot.