Steve Martin as George Banks

Diane Keaton as Nina Banks

Martin Short as Franck Eggelhoffer

Kimberly Williams-Paisley as Annie Banks-MacKenzie

George Newbern as Bryan MacKenzie

Kieran Culkin as Matty Banks

BD Wong as Howard Weinstein

Peter Michael Goetz as John MacKenzie

Kate McGregor-Stewart as Joanna MacKenzie

Jane Adams as Dr. Megan Eisenberg

Eugene Levy as Mr. Habib

Rebecca Chambers as Young Woman at Gym

April Ortiz as Olivia

Dulcy Rogers as Ava (the Beautician)

Kathy Anthony as Beautician #2

Adrian Canzoneri as Justin

Lori Alan as Wife Mrs. Habib

Stephanie Miller as Annie Banks (Age 4)

Hallie Meyers-Shyer as Annie Banks (Age 7)

Jay Wolpert as Dr. Brooks

Ann Walker as Dr. Brooks' Nurse

Sandra Silvestri as Jogging Mom

William Akey as Frantic Father #1

Jonathan Emerson as Frantic Father #2

Seth Kaplan as Wild Four-Year-Old

Joshua Duvall Preston as Tantrum Toddler

K.C. Colwell as Father Heading off to Work

Chase Colwell as Adorable Toddler

Tony Simotes as Construction Foreman

Annie Meyers-Shyer as Shower Guest

Linda DeScenna as Shower Guest

Heidi Averill as Shower Guest #2

Chelsea Lynn as Matty's Friend

Sue Colwell as Nina's Customer

Rodrigo Botero as Gang Kid

Vince Lozano as Gang Kid #2

Caroline Lagerfelt as Check-In Nurse

Ilene Waterstone as Check-In Nurse #2

Wendy Worthington as Prostate Nurse

Dorian Spencer as ER Nurse

Harris Laskawy as Prostate Doctor

Roxanne Beckford as Nina's Nurse

Valerie Hemmerich as Nina's Nurse #2

Peter Spears as Dr. Wagner

Susan Beaubian as Annie's Nurse

Mychael Bates as Hospital Orderly

Jerri Rose White as Newborn Megan Banks

Shannon Kennedy as Newborn Megan Banks

Casey Boersma as Newborn George Banks-MacKenzie

Katie Pierce as Two-Month-Old Megan Banks

Dylan Boersma as Newborn George Banks-MacKenzie

Jonathan Selstad as Two-Month-Old George Banks-MacKenzie

Thomas Selstad as Two-Month-Old George Banks-MacKenzie

Christian Boeving as Gym Trainer (uncredited)

Nora Dunn as Realtor (uncredited)

David Novak as Man in Gym (uncredited)

Kylie Travis as Girl in Car (uncredited)