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American Infant Add-On Rules by Region (Domestic vs. Intl)
Can I add a lap child to an already booked United Ticket?
Can I add a child to my booked Frontier flight ticket?
Add Infant to Award Ticket on Frontier : What to Know
Can You Add Infant to Frontier Itinerary with Only One Adult?
Tips for Parents: Add Baby on Frontier for Smooth Check-In
Booking a Baby on Southwest? Read This Before You Add Infant