Trusted Pediatric Care at Mill Brook Pediatrics

Mill Brook Pediatrics, we believe every child deserves exceptional care delivered with compassion, expertise, and respect. Our dedicated pediatricians and caring staff are committed to supporting your child’s health and development at every stage. When you choose Mill Brook Pediatrics, you’re partnering with a team that treats your family like our own—providing guidance, comfort, and trusted medical care in a nurturing environment. We’re honored to be your child’s medical home and look forward to building a lasting relationship focused on lifelong wellness.

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1. MILL BROOK PEDIATRICS Phone: 978-443-0707 490C Boston Post Road Sudbury, MA 01776
2. MILL BROOK PEDIATRICS Mill Brook Pediatrics is where compassionate care meets medical excellence. Our team of dedicated pediatricians is committed to supporting your child’s health, growth, and happiness through every stage of life. We understand that every child is unique, which is why we take the time to listen, guide, and provide personalized care that helps families feel confident and supported. From your baby’s first checkup to adolescent care, we’re here to make every visit a positive experience. At Mill Brook Pediatrics, we’re more than a medical practice—we’re your trusted partners in building a bright, healthy future for your child. Phone: 978-443-0707 490C Boston Post Road Sudbury, MA 01776
3. ABOUT MILL BROOKS PEDIATRICS Mill Brook Pediatrics: A Legacy of Compassionate Pediatric Care in Sudbury About Us Founded in 1994 by Dr. Lauren Geddes, Mill Brook Pediatrics has grown from a small, community-centered office into one of Sudbury’s most trusted names in pediatric healthcare. What began as a heartfelt mission to provide attentive, family-focused care has evolved into a practice known for its warmth, professionalism, and dedication to every child’s well-being. In 2001, the practice moved to its current home in the Emerson Medical Building at 490C Boston Post Road, a space designed to deliver comfort and convenience to every family we serve. After decades of exceptional service, Dr. Geddes and her husband, Dr. Bill Wirth, proudly transitioned the practice to Weston Pediatric Physicians, PC—a respected leader in pediatric care since 1964. This partnership allows us to extend our tradition of personalized, high- quality care to a broader Metro West community while maintaining the close, welcoming environment that families have trusted for generations. 24/7 Pediatric Coverage Your child’s health matters around the clock. Our experienced pediatricians are available 24 hours a day, 7 days a week—including weekends and holidays—so you can reach us whenever your family needs support. For urgent concerns, we also provide convenient after-hours appointments at our Weston office following nurse triage. Convenient, Integrated Care Located within the Emerson Medical Building, our patients have easy access to a variety of on- site services, including lab testing, X-rays, and consultations with other medical specialists such as Internal Medicine, OB-GYN, Orthopedics, Surgery, and Podiatry. This integrated setting ensures seamless, efficient care—all under one roof. Hospital Affiliations & Network Our physicians maintain active privileges at leading hospitals, including Emerson Hospital in Concord, Brigham and Women’s Hospital, and Newton-Wellesley Hospital. Through our affiliation with the Partners Community Healthcare network, we’re able to deliver coordinated, comprehensive care that meets the highest standards in modern pediatrics. Insurance & Accessibility We welcome most major insurance plans and encourage families to confirm coverage with their providers. Our staff is always ready to assist with any questions to make your visit as smooth and stress-free as possible. At Mill Brook Pediatrics, we carry forward the same core values that inspired our founding— compassion, clinical excellence, and a steadfast commitment to helping every child grow up healthy, confident, and thriving.
4. OUR SUDBURY STAFF Our caring medical and administrative Our Sudbury Staff is eager to welcome you and your child, ensuring a warm and supportive healthcare experience. Please share any questions or concerns—our staff is always ready to assist you promptly and compassionately. Karen, a dedicated Family Nurse Practitioner, joined Weston Pediatrics in March 2011, bringing extensive experience in pediatric and family medicine. With a Master of Science from Regis College and a background in psychology, she specializes in concussion management and asthma education. Passionate about adolescent care, she focuses on supporting at-risk teens, adolescent-GYN, and integrative health while promoting education and prevention through compassionate, patient-centered care. Karen Ashworth, FNP, AE-C
5. Dr. Katherine Bui received her undergraduate degree from Scripps College, in Claremont, California, and her M.D. from Boston University School of Medicine. Dr. Bui completed her residency at Massachusetts General Hospital where she pursued particular interests in infant development and medical education. She is board certified in pediatrics and is a member of the Massachusetts Medical Society and the American Academy of Pediatrics. Dr. Bui is in the office on Monday, Tuesday and Wednesday from 8am–5pm, and Friday from 8am–12pm Katherine M. Bui, MD
6. Dr. Rose Dieffenbach, a board-certified pediatrician and fellow of the American Academy of Pediatrics, brings global experience and deep clinical expertise to her practice. After earning degrees from UCLA, the University of Michigan, and George Washington University, she completed her residency at UCSF and served as a U.S. Navy pediatrician in Japan, Italy, and Washington. Before joining Weston Pediatrics, she provided emergency care at Boston Children’s Hospital. Dedicated to children’s health at every stage, Dr. Dieffenbach offers compassionate, comprehensive care and is available in the office Mondays and Fridays (8am–12pm) and Wednesdays and Thursdays (8am–5pm). Rosemarie Dieffenbach, MD, MPH
7. Dr. Robert Andler, a board-certified pediatrician and fellow of the American Academy of Pediatrics, brings extensive experience and compassionate care to every family he serves. A graduate of Cornell University and the University of Virginia School of Medicine, he completed his pediatric internship and residency at Hasbro Children’s Hospital and Brown University in Rhode Island. Before joining Weston Pediatrics, Dr. Andler practiced in Rhode Island, where he developed a strong reputation for his patient-centered approach. He is available in the office Mondays (8am–8pm), Wednesdays and Fridays (8am–5pm), and Thursdays (8am–12pm). Robert H. Andler, MD, FAAP
8. Dr. Bernstein brings an exceptional blend of medical expertise, research experience, and compassionate care to Weston Pediatrics. He earned his A.B. and Ph.D. in Genetics and his M.D. from The University of Chicago, followed by a pediatric residency at Boston Children’s Hospital and a hematology-oncology fellowship at both Children’s Hospital and the Dana-Farber Cancer Institute. Before joining Weston Pediatrics in 1990, Dr. Bernstein led a distinguished research career. As an Assistant Clinical Professor of Pediatrics at Harvard Medical School, he continues to mentor future physicians while providing outstanding patient care. Board-certified in pediatrics and a fellow of the American Academy of Pediatrics, Dr. Bernstein has a strong clinical focus on hematology and oncology, also caring for young patients at The Jimmy Fund at Dana-Farber. He is available in the office Monday, Tuesday, and Thursday (8am–5pm) and Wednesday (1pm–8pm). Shelly C. Bernstein, MD
9. THANK YOU Phone: 978-443-0707 490C Boston Post Road Sudbury, MA 01776