In all honesty, Jyn has played herself because she doesn't have the medical go ahead to get down to business and she is as riled up as Cassian's not very well disguised erection.

She tries to focus on the baby, humming a lullaby that is, in reality, just a hummed version of Sin Pijama. It's not exactly appropriate for a baby but it's not like she's singing it. And it's not like he would know the difference if she were singing it.

Which she starts, soft and quiet, when Mateo makes a whining noise when Jyn attempts to lay him down. Fine, she'll keep rocking him a little while longer, swaying around the room and flashing her husband a small smile. "If you want to put your pajamas on so I can take them off, that would cut down on some time."