He rolls over to snuggle Donna and is startled when her side of the bed is empty and cold. He groggily rubs his eyes and looks at the clock, which reads 3:45 AM. Pulling on his pyjama bottoms, the Doctor tiptoes down the hall towards the nursery. That's when he hears it, Donna's soothing voice singing an old Galifreyan lullaby. The same lullaby that his mother sang to him when he was a child oh so long ago. She must have learned it from the TARDIS before the baby was born.

He stands in the doorway and quietly takes in the view. Donna gently rocks their newborn daughter in the rocking chair Wilf gave them. She gazes into the sleeping baby's face and smiles. The Doctor can't believe their daughter is finally here. He had given up hope of ever being a father again, but Donna changed that. She showed him how to love again, how to find pleasure in the small moments and that having a partner in crime is much more fulfilling than a life alone.

Just as she finishes the song, the Doctor makes his way to Donna's side. He kneels next to the rocking chair and gently rubs the tuft of ginger hair on his daughter's head. "She is perfect", he whispers into Donna's ear.

"Yeah. She really is", she kisses the baby's forehead.

"Do you want to come back to bed? ", he mumbles as he helps her to her feet.

Donna gently places the sleeping baby in her crib and covers her in the same blanket Sylvia had wrapped her in so many moons ago while the Doctor runs an arm around her waist. The pair watches their darling child peacefully sleep for a few moments. Donna turns around to face the Doctor as he pulls her into an embrace. She lays her head on his chest and takes in his unique scents, one of space and time and peppermint.

"My mother used to sing me that lullaby, Donna. I never thought I would be able to hear it sung to my child. And I can't believe it's possible, but I grow to love you more and more every day", the Doctor leans in and kisses Donna. "Now let's get you back to sleep, Earthgirl."