Any moms booked with their child(ren) through hotwire and got delta. (Domestic flight). What did you…

Any moms booked with their child(ren) through hotwire and got delta. (Domestic flight). What did you need to bring at the check in? I know I'll need my ID. But what about the kids? Mine are 5&6. I want to be sure before I go and don't have what they ask of me. Do I also need to print the receipt of the reservation or will they pull it up? Well I'm sure from other sites delta still ask the same. My kids had to be booked in as adults because that's the only option they had...