Mark Underwood, M.D., M.A.S.

Mark A Underwood, M.D., M.A.S.






  • Chief of Neonatology
  • Professor


To see if Mark A Underwood is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).

UC Davis Children's Hospital

2315 Stockton Blvd.
Sacramento, CA 95817
Driving Directions

Primary Phone:

Additional Phone Numbers

Physician Referrals: 800-4-UCDAVIS (800-482-3284)

Philosophy of Care

Caring for a premature or sick newborn requires a team of dedicated professionals. I love working with parents, nurses, pharmacists, respiratory therapists, dietitians, social workers, and specialists to provide the very best care for these fragile little guys.

Clinical Interests

Dr. Underwood's clinical activities are in the care of premature and sick newborn infants. His research interests include necrotizing enterocolitis, development of intestinal innate immunity, and mechanisms of probiotics and prebiotics in pre-term infants.

Research projects include clinical trials of probiotics and prebiotics in premature infants, assessment of Paneth cell antimicrobial expression in infants with necrotizing enterocolitis, and evaluation of Paneth cell expression in newborn rats.

Research/Academic Interests

Dr. Underwood's research is focused on prevention of common health problems of very premature infants, including necrotizing enterocolitis, sepsis, and poor growth after birth.

This includes discovery of the mechanisms by which human milk protects the intestinal tract, and how human milk and probiotics work together to shape the composition of the intestinal microbiota and influence the baby's developing immune system.



Center/Program Affiliation

UC Davis Children's Hospital


M.D., University of Texas, Southwestern Medical School, Dallas, Texas, 1987

M.A.S., UC Davis, Davis, California, 2008

B.A., Brigham Young University, Provo, Utah, 1983

Internship: UCLA, Los Angeles, California, 1988


UCLA, Los Angeles, California, 1990


UC Davis Medical Center, Sacramento, California, 2006

Board Certifications

American Board of Pediatrics, 2004

American Board of Pediatrics, Neonatal-Perinatal Medicine, 2008

Professional Memberships

Fellow, American Academy of Pediatrics

Society for Pediatric Research

Western Society for Pediatric Research

Honors and Awards

UC Davis Chancellor's award for Innovator of the Year, 2020

Dean's Team Award for Excellence, 2013

Eli Gold Faculty Achievement prize, 2012

Alice Litman Moss Pediatric Resident award, 1990

Karl G Maeser Scholar, 1982

National Merit Scholar, 1977

Brigham Young University Trustee Scholar, 1977

Select Recent Publications

To view a list of Dr. Underwood's publications, please visit his PubMed page here

Recent Videos


Q&A with Dr. Mark Underwood


Top pediatric specialty care, close to home -- UC Davis Children's Hospital