They don't know which baby will come first. And there's something Anna should have done a while ago. She looks over to a nurse, beckoning her over with her free hand.

Elsa's gone back to focusing on her breathing, but Anna still keeps her voice down.

"One is a stillbirth," she says softly. "Is there something... I don't know... something to remember?"

The nurse levels a small, sympathetic smile. "Of course. A memento?" Anna nods. "Leave it with me."

She hopes it will be okay. Elsa should be able to hold her baby at least once.