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Meet our team at Jacksonville Kids Pediatrics! Please take a few moments to learn about our skilled practitioner and our friendly, nurturing staff.

At Jacksonville Kids Pediatrics, we consider it both a great joy and responsibility to care for children. Most of us are parents ourselves, so we strive to be understanding and available to the families we are privileged to serve. We are honored that you have chosen us as your child's primary medical provider and are confident that you will be pleased with the quality of care and service that we can provide you and your family.

A vital part of our service to children begins with our outstanding staff who works hard to manage and maintain a professional, caring and supportive environment for our patients in a timely manner. Our doctor is a lifelong learner. Not only has she received advanced medical training in pediatrics, she continually pursues ongoing education to stay abreast of the latest in child health care.

Your child's health is as important to us as it is to you. We look forward to providing you with excellent medical care your child deserves.

Dr. Kostur and her family

Dr. Alexandra Kostur

Pediatrician in Jacksonville, FL

Jacksonville Kids Pediatrics

Dr. Kostur is a board-certified pediatrician with over a decade of pediatric experience in general office pediatrics and emergency pediatrics.  Dr. Kostur is a fellow of the American Academy of Pediatrics and completed her pediatric residency in 2003 at one of the nation's top-ranked children's hospitals,Cincinnati Childrens Hospital Medical Center.  

She has several years of experience working as a pediatrician in one of the busiest children's emergency rooms in the country and at a well-respected private pediatric practice.  Dr. Kostur earned her M.D. from Loyola University of Chicago in 2000 and completed undergraduate studies at Northwestern University in Evanston, IL.  Dr. Kostur is affiliated with and an active staff member at Baptist Hospital, Wolfson's Children's Hospital, and Baptist South Medical Center. 

In 2008, after relocating from Cincinnati, Dr. Kostur started her own practice - Jacksonville Kids Pediatrics.   Dr. Kostur resides in Jacksonville with her husband, Dr. Michael Petr, and their two children, Michael, age 15, and Eva, age 12.

Dr. Kostur emphasizes the importance of keeping her patients safe and healthy.  She is a strong advocate for public education on pediatric healthcare topics and the prevention of childhood injuries.  Dr. Alex has been a featured television guest on several Jacksonville local TV news stations.  Her appearances include Blue Cross Blue Shield's  Gloria Steinberg, host of "Medical Update" discussing the important topic of pediatric obesity.   Dr. Kostur's recent media appearances also include several interviews discussing choking hazards, hot dog safety, as well as Halloween Safety and infant CPR on the Channel 4 and Channel 47 morning shows. Dr. Kostur's recently published an editorial on newborn care posted on the premiere edition of Jacksonville's Expectant Mother's Guide.

Dr. Sara

Dr. Roman Criollo

Dr. Criollo attended the University of Illinois at Chicago where he obtained his medical degree training in 2005. He completed his pediatric residency training at Children’s Hospital of Wisconsin in Milwaukee. After 3 years of working in a rural community in central Illinois, he settled into the Jacksonville area in early 2019. Dr. Criollo is a member of the American Academy of Pediatrics and is board certified in Pediatrics. He also speaks Spanish fluently. Dr. Criollo has been happily married for 15 years to his beautiful wife and is a proud father to a 6-year-old boy who is into robotics. Dr. Criollo enjoys playing the piano, martial arts including Wing Chun (which is a form of Kung fu), and spending time with his wife and son at the beach. Dr. Criollo was born and raised in Chicago and is also a huge Cubs and Bears Fan.

Dr. Sara

Sara Dahbour, A.P.R.N

Pediatrician in Jacksonville, FL

Jacksonville Kids Pediatrics

Sara is a board-certified Pediatric Nurse Practitioner with over 5 years of experience in pediatric primary care. She received her Master of Science in Nursing degree from the University of Florida in 2014, graduating with honors. She attended Florida State University in Tallahassee for her undergraduate studies and her BSN.

After graduating from nursing school in 2009, Sara moved to Jacksonville to begin her career in the Pediatric Oncology and Bone Marrow Transplant unit of Wolfson Children’s Hospital. It was there she learned the skills necessary for taking care of children with compassion and adapted a family-centered approach to treatment. 

One of Sara’s favorite parts of working in primary care is being able to watch children grow and develop from infancy and witness each new milestone they attain along the way. She takes a calm and reassuring approach when meeting your child, and understands that treating a symptom or illness does not always include medication. Sometimes a hug or giving encouragement can go a long way!

Sara lives in Jacksonville Beach with her husband, Shawn. In her free time she enjoys travelling, working out, reading, and enjoying a good cup of coffee.


Dr. Sara

Carolyn Williams, APRN

Carolyn joined our practice in December 2019. She is a board-certified pediatric nurse practitioner in primary care. She received a bachelor’s degree from the University of Mississippi in 2011, minoring in biology, psychology, and Spanish. She then worked in a doctor’s office here in Jacksonville before pursuing a nursing degree. She earned her Bachelor of Science in Nursing from the University of Alabama at Birmingham in 2015. After completing nursing school, she worked as an RN at Children’s of Alabama for over a year before moving back to Jacksonville. She completed her Master’s in Nursing in 2019. She has now worked at Wolfson Children’s Hospital for over three years. Through her career in the hospitals, she has cared for many children with chronic conditions and common respiratory conditions. Outside of work, she enjoys painting, being with her family, spending time at the beach, running, and playing tennis.