Welcome to Canterbury Pediatrics, where children come first, and where pediatricians and parents work together to provide exceptional medical care for kids.  We pride ourselves on providing compassionate, comprehensive services to children from birth through adolescence, and we’re glad you’ve chosen us as your children’s medical home.

Whether it’s your child’s first visit to our office, or a routine well-child checkup, we strive to make sure you and your child are always comfortable and informed.  We take the time to talk to parents to help you understand your child’s needs, and we equip you with the knowledge necessary for promoting a lifetime of optimal health and wellness.

We invite you to take a few moments to explore our informational website and familiarize yourself with our practice.  Our website gives you easy access to our pediatric practice, including directions, hours of operations, payment policies, information about our physicians and our services, and even a link to request an appointment.

We want to thank you for choosing Canterbury Pediatrics for your child’s medical care and welcome you to our practice.  Our friendly and highly knowledgeable staff is available to support and assist you with any questions or concerns you may have.  For questions or to schedule an appointment, contact our office today!


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Meet the Doctors

  • Marilyn Smith
    M.D., F.A.A.P.

    Dr. Marilyn Smith is an exceptionally skilled pediatrician who strives each day to treat her patients with optimal care.  She has a vast fund of knowledge in pediatric medicine and has been a pediatrician for over 20 years.  Dr. Marilyn received her Bachelor’s Degree in Biology from Yale University and then earned her MD at the University of Cincinnati, College of Medicine.  She completed her residency training at Yale New Haven Hospital and is Board Certified by the American Board of Pediatrics.  In 1999, Dr. Marilyn was selected as Top Doctor by Connecticut Magazine and again in 2006 by New York Magazine.  She more recently received a Patients’ Choice recognitions award.  Dr. Marilyn has a cheerful personality that puts her patients and families at ease.  She truly enjoys what she does.

  • John Tsalapatanis
    M.D., F.A.A.P.

    Dr. John Tsalapatanis is an experienced, Board Certified Pediatrician who has dedicated his life to keeping his patients healthy and happy.  Dr. John graduated with a Bachelor’s Degree in Biology from Fairfield University.  He received his Doctor of Medicine Degree from Ross University School of Medicine in Dominica, West Indies and trained in pediatrics at Overlook Hospital in Summit, NJ.  In his third year of residency training, he served as Chief Resident.  Having been a pediatrician for over 20 years, it’s no surprise that Dr. John has grown a special bond with his patients making the visit to the doctor an enjoyable experience.  Child care is not solely an occupation; it is a living that Dr. John pursues with a passion.

  • Gretchen Carlin
    A.P.R.N., I.B.C.L.C.

    Gretchen is a Board Certified Pediatric Nurse Practitioner. She loves working with children of all ages but has a special passion for providing breastfeeding support. She is an International Board Certified Lactation Consultant (IBCLC) and has been providing breastfeeding support for more than 4 years. Gretchen graduated from the United States Military Academy with a Bachelor of Science in Geography. After six years as an Army Officer, she switched careers and earned a Master's of Science in Nursing from Boston College. During her time at Boston College, she had clinical placements at Boston Children's Hospital and Massachusetts General Hospital as well as several independent Pediatric Primary Care practices. Gretchen aims to build strong relationships with families to foster each child's growth, development and health. 

  • Amanda Nederlof, APRN

    Amanda is the newest member of the Canterbury Pediatrics team. She joins asa board certified Pediatric Nurse Practitioner, who graduated from the Yale School of Nursing in 2018. She is a member of Sigma Theta Tau, the International Honor Society of Nursing. During her time at the Yale, Amanda focused her work in clinical environments with children, which included the school based setting, community health, as well as the private practice setting. Her specialty rotation through pediatric Ear, Nose, and Throat has particularly stuck with her and she enjoys taking this specialty knowledge with her into the primary care office. During her schooling, she worked as an Registered Nurse at the Yale Health Center in the Pediatrics and also spent a summer working as a camp nurse for a local CT summer. Most recently, she has worked as an APRN in the East Lyme area before moving with her husband closer to family in the Fairfield county area. When not working, you can find her reading a good mystery novel, hiking, playing her favorite sport, tennis, or spending time with close family and friends Amanda is looking forward to providing patient-centered care for children and their families and hopes that she can help make coming to the pediatric office a fun, interactive experience for everyone.


  • "I can trust the health of my children with Canterbury Pediatrics"
    Stephanie De Leon
  • "The best pediatricians to take your kiddos to. My kids love seeing Dr. Smith when they’re sick"
    Jennifer R.
  • "The care and compassion of Dr. Smith and staff are what keep us coming back to Canterbury Pediatrics"
    The Johnson Family

Featured Articles

Read about helpful topics

  • Immunizations

    Immunizations have been one of the single greatest advances in preventative medicine and an essential part of well-child care. Our practice follows the immunization guidelines recommended by the American Academy of Pediatrics (AAP). For information about these vaccines, the diseases they protect against, ...

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  • Center for Disease Control and Prevention

    CDC.gov (www.cdc.gov) is your online source for credible health information and is the official Web site of the Centers for Disease Control and Prevention (CDC). CDC is committed to achieving true improvements in people's health. CDC applies research and findings to improve people's daily lives and responds ...

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  • Child Health Topics

    From asthma to immunization, find out more about what the American Academy of Pediatrics recommends for your child’s health. You’ll gain access to a wide variety of information on developmental stages, safety, and advocacy for babies, children, teens, and adolescents from the AAP. Featured Health ...

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  • Traveling with Children

    Traveling with children requires special planning and preparation, especially when travelling abroad. There are many things parents should consider when traveling with children of any age. Visit the CDC™ Traveling with Children page for helpful resources on travel including: Safe food and water precautions, ...

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  • Product Recalls

    Child products, such as cribs and toys are often recalled due to a defect or hazard. It’s important to pay close attention to recalled consumer goods to protect your child from dangerous items. Visit this site frequently to ensure that the products your child is using have not been recalled by their ...

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  • Car Seat Recommendations

    As a parent, it is your job to protect your child when riding in a vehicle. Using car seats properly helps keep children safe. But with so many different types of car seats on the market, understanding how to use them correctly can be overwhelming for parents. Visit the AAP™ Car Seat Safety Information ...

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  • Breast Feeding

    We understand many women may be apprehensive or unsure at first about breastfeeding vs. bottle-feeding their baby. It’s normal to have many questions related to breastfeeding. Our doctors are here to support you. La Leche League was founded to give information and encouragement, mainly through personal ...

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Location & Hours

Our Location

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Hours of Operation

Our Regular Schedule

Map and Location


8:30 am-5:00 pm


8:30 am-5:00 pm


8:30 am-5:00 pm


8:30 am-5:00 pm


8:30 am-5:00 pm


8:30 am-12:00 pm

Same Day Sick Appt. Only


Appt. made per on-call doctor