Originally Posted by
levilevi
Our diaper bag...
Essential baby items are exempted from fees under the
Sports Equipment and Special Items banner.
Baby Items- Essential
Diaper bag, stroller. Refer to Child Restraint systems for information on Car Seat and Restraint devices.
Refer to Strollers for more information on child mobility.
Exempt item when traveling with the infant, no charges apply.
Checked: Yes
Carry-On: Yes
Except where required under the Montreal Convention, Frontier is not liable for the mentioned items if you pack them and they are damaged unless packaged in a hard-sided case
https://www.flyfrontier.com/travel-information/baggage/