"Dr. Van Vleck thinks ahead to help my daughters prepare for summer, for social dynamics, athletics, and other things that go along with their ages. She provides 360 degrees of care in a kind and respectful manner." -M.C.

"We have been patients for 7 years and would not think about switching practices. The level of detail and advocacy that Dr. Sexter gives is most impressive. She is the best! We sleep better knowing that our son is in Dr. Sexter’s care. I’m so happy we found her." -D.Z.

"The kids both love seeing Dr. Long and she is always so thorough. It’s always a wonderful experience." -L.G.

"We love Spring Valley Pediatrics overall. We have always had great experiences and they are so willing to take the extra time with us every time we are sick. Our pediatrician, Dr. Caroline Van Vleck is the best pediatrician we have ever had. She cares for my children as if they were her own." -C.S.

"Dr. Sexter has always been pleasant, attentive and patient with my daughters as patients, and very patient with me when I have questions. She is thorough and always takes the necessary time to accurately diagnose my child. Her nurse Jennifer is exceptionally responsive, helpful, and the office is very well organized." -J.F.

"We are so grateful for the wonderful and dedicated care that Dr. Sexter has given to our daughter over the years — we could come to her with any problem, and she always helped her in such a compassionate and brilliant way. And we have always found the Spring Valley practice so lovely and accommodating, from the great nurses, to the lab, weekend hours, and morning call in times." –M.G.

"Dr. Long was very likable and easy to talk to. She immediately made my 5-year old feel comfortable. She explained things clearly and was a pleasure in general." -L.B.

"Dr. Long is always great with my daughter and very thorough. She is never rushed and always takes the time necessary to treat my daughter." -J.W.

"Dr. Palumbo has been my children’s pediatrician for 10 years. He is great with all the kids. He spends time during the visits. He is extremely patient and overall a great and reassuring doctor." -M.S.

"I brought in my sick and unhappy ten month old for a visit. We were able to easily schedule an appointment to get in quickly to see the doctor. Dr. Palumbo was so comforting to her while he examined her. It’s never fun to have a sick child, but Dr. Palumbo and Spring Valley Pediatrics ensure that our children are seen quickly and are well cared for." -D.B.

"Dr. Palumbo is holistic, wisely conservative with medication, and discusses avenues to pursue with patient and parent." -N.Y.

"We’ve been seeing Dr. Warfield for 12 years and really couldn’t be happier with his care. He is diligent in diagnosis, willing to listen and very thorough. He is compassionate with the children and they love him." -N.S.

"Dr. Warfield is an exceptional pediatrician. He relates well to both the children and their parents by making both feel at ease in sometimes difficult situations. I feel free to call the office day and night with any questions and I know I will get a quick and thoughtful response." -A.M.

"Dr. Warfield is a great physician. He is so gentle with our children and I always feel like they are in excellent care with him. He always takes the time to listen to my concerns, evaluate the situation, and thoughtfully discuss the possibilities." -J.M.

"Dr. Warfield is a warm and engaging physician, always happy to spend time getting to know the patient. He is a very kind and helpful man, an amazing doctor who will listen and follow up." -F.L.

"We have been seeing Dr. Warfield since my son was born 11 years ago. He always takes the time to do a thorough examination and answer any questions we have. He is knowledgeable and extremely kind. We have total confidence in Dr. Warfield and recommend him to all our friends. He is also really great with kids." -R.P.

"The doctors at Spring Valley Pediatrics are fantastic, caring, responsible, and responsive. Overall we have a great experience every time we come." -Z.Y.

"The practice will always let us schedule same day appointments and they are always able to fit us in. All the doctors are very kind and willing to spend extra time answering my questions." -N.C.

"I love that I can call in the morning and speak to my doctor directly during their call-in time. I never have a problem getting an appointment." -T.W.

"The doctors at Spring Valley Pediatrics have been wonderful in guiding both of my children - and us, as parents -- through complex chronic illnesses. We have two children in their 20’s now and we will greatly miss the care we have received." –M.G.

"We LOVE Dr. Sexter!! This is one of the best practices in the entire metropolitan area. We saw Dr. Palumbo for years before switching to Dr. Sexter several years ago when my daughter (entering adolescence) requested a female doctor. They are both superb." –P.G.

Office Hours


9:00am – 5:00pm

Weekends and Holidays (Open 365 days a year)

On weekends and holidays we see sick children in the office in the mornings as needed. Please call the office after 8:00 am on a weekend or holiday to schedule your appointment for that day.

After Hours

At Spring Valley Pediatrics we pride ourselves on being readily accessible to our patients. We have a doctor on call and in the office every day of the year, including weekends and holidays.

  • Weekends and Holidays
    We see sick children in the office in the mornings as needed. Please call the office after 8:00 am at 202-966-5000 to get on the schedule for the day.
  • Evenings
    Call the main Spring Valley Pediatrics number 202-966-5000 and you will be forwarded to the answering service. If your call is an emergency, please be sure to communicate this to the operator. The on-call doctor will return your call. In the unlikely event that you have not heard back in 30 minutes, please call the answering service and ask that the doctor be paged again.
  • Doctor Call-In Hours
    Each doctor is available on weekday mornings by telephone. The doctor call-in times are a great way to reach your doctor directly to ask any questions that you may have about your child’s health. Please see the Doctor Call-In Hours section below for call-in times and numbers.

Doctor Call-In Hours

Each doctor is available on weekday mornings by telephone during their call-in hours. The doctor call-in hours are a great way to reach your doctor directly to ask any questions that you may have about your child’s health and to schedule sick visits. Please see the table below for call-in times and numbers. Please note that the call-in phone numbers will only reach the doctors during the stated call-in times. If you need to reach a doctor at any other time, please call 202-966-5000.

Doctor Morning Call-In Time Phone Number Call-In Days
Dr. Palumbo 8:30 – 9:00 am 202-966-0815 Monday – Friday
Dr. Van Vleck 8:30 – 9:00 am 202-362-6289 Monday –  Friday
Dr. Sexter 8:00 – 8:30 am 301-279-0280 Monday – Friday
Dr. Warfield 8:00 – 8:45 am 202-966-1215 Monday – Friday
Dr. Long 8:30 – 9:00 am 202-443-1616 Monday – Friday
Dr. Moss 8:00 – 8:45 am 202-204-3382 Monday – Friday


We will do everything we can to accommodate your schedule and will provide same day appointments for sick visits. Please call us in advance to schedule a time.

New Patients

If you are coming to our practice for the first time, you may complete New Patient Forms prior to arriving.

Well Child Visits

Call 202-966-5000 to schedule a well child visit with your doctor.

Sick Child Visits

Call 202-966-5000 or your doctor during their call-in hours to make all sick visit appointments.


If you have made an appointment but are unable to keep it, please contact us at least 24 hours in advance.

Late for an Appointment

Please call and we will try to work you into the schedule later that same day.

No Show Policy

We understand that there are times when you must miss an appointment due to emergencies or obligations for work or family. However, when you do not call to cancel an appointment, you may be preventing another patient from getting much needed treatment. Conversely, the situation may arise where another patient fails to cancel and we are unable to schedule you for a visit, due to a seemingly “full” appointment book. We will charge a fee for any appointment that is not cancelled at least 24 hours in advance.

Contact Spring Valley Pediatrics