Stephen Campbell Moore

Justin

Clémence Poésy

Kate

David Morrissey

Jon

Laura Birn

Theresa

Deborah Findlay

Tessa

Jonathan Harden

Mark

Tuyen Do

Allergy Doctor

Laila Alj

Sonographer

Christos Lawton

Phil

Stephanie Jacob

Registrar

Natasha Alderslade

Babyshower Woman (uncredited)

Anna Madeley

Abi

Sarah Malin

Sonographer 12 Weeks

Daniel Easton

Kate's Colleague

Franc Ashman

Indhu

Sam Pamphilon

Tom

Elliot Mills

Baby Billy

Joseph Mills

Baby Billy