Assuming that you are looking at purchasing Wanna Get Away fares/tickets just purchase an additional ticket for the infant with their name listed as the passenger. If you are looking at Anytime fares/tickets you can call a request the child discount, but it will not be cheaper than the Wanna Get Away fare. Purchasing Wanna Get Away tickets for children also means you do not need to provide proof of their age as you would have to do with an Anytime fare and TSA doesn't require ID for any minor. When you get to the gate, inform the gate agent you would like to gate check a stroller and they'll tag it for you. It can then be left plane side when you board. Family boarding is between the A and B boarding groups or if you all have A boarding passes you can board in the A group as assigned. Have a great trip!
