I am flying Delta RDU-MBJ on 6/29. I have made arrangements for an infant in lap and have paid for the lap seat. The last time I made this same trip, I paid for the infant (different infant) at check-in, but this time did it in advance.

I assume that I was provided a paper ticket at international check in since I did not make arrangements until I checked in (i.e. no home printed boarding pass).

What I don't know is if I will be able to print a boarding pass or if Delta should have mailed one at the time of booking.

Does anyone have experience with this situation? Say Delta attempted to send boarding passes but I did not receive them (or likely misplaced them), would I need to contact them to have official printed passes or will I be able to check the infant in as I would check myself in?

Thanks