Mercy Clinic Pediatrics O'Fallon, Wentzville and Winghaven

01/07/2026

Mercy Pediatrics will continue to follow the evidence-based AAP Immunization Schedule. Please follow the link below to learn more about immunizations and the diseases they prevent. If you have any questions, please discuss with your pediatrician.

12/23/2025

Our 3 office locations:

12/24 8-10:30am O’Fallon Winding Woods Drive
12/25 closed
12/26 10am-4:00pm all 3 locations
12/27- normal saturday hours: 8am- 10:30am

Nurse exchange number: 314-364-5277

12/02/2025

We will be opening at 10 am today so that our staff can arrive safely.
If you had an appointment before 10, we will be reaching out to you to reschedule your appointment!

Stay warm!

11/27/2025

Happy Thanksgiving!

All 3 locations will be closed today 11/27.
Our phones will turn on tomorrow 11/28 at 8am.

Mercy Convenient Care will be closed today 11/27 and will be open tomorrow 11/28 from 12pm to 6pm.

11/09/2025

If you are utilizing ByHeart formula for your infant, please verify the lot numbers for a recall due to the risk of infant botulism.

[New York, NY] – ByHeart, a next-generation baby nutrition company, announced today that, out of an abundance of caution, it has chosen to voluntarily recall two batches of ByHeart Whole Nutrition Infant Formula following notification from the U.S. Food and Drug Administration (FDA) of a broader o...

10/31/2025

Happy Halloween! Our office will be closing at 3 PM today to allow our providers and staff to be with their families for the holiday. Have a great and safe Halloween! 🎃

09/03/2025

We are now booking appointments for Flu shots.

We also book appointments Monday through Friday 7:30 am to 8:50 am.

Or may schedule with one of our flu clinics dates below!

09/01/2025

Our office will be closed today 9/1. And will resume to normal hours Tuesday 9/2: 7:30-4:00pm.

Our number for the after hours exchange is
314 364 5277

Hope you enjoy the rest of your holiday weekend!

08/19/2025

Our practice is growing again!

We would like to welcome Dr. Jasmine Kaur to Mercy Clinic Pediatrics. Dr. Kaur is accepting new patients at this time. For appointments, please call 636-978-7902. We are very excited to add her to our team!

07/03/2025

Happy 4th of July! We will be closed tomorrow, July 4th, and will reopen Saturday 7/5, for same day , sick visits. Mercy Kids Convenient care will also be closed tomorrow and will reopen for regular buisness hours Saturday 7/5.

Have a safe holiday! 🎇

06/30/2025

Starting 7/1, our phone hours will be changing:

Monday thru Friday: 7:30am to 4 pm
Saturday: 8:00 am to 10:30am.

06/10/2025

We would like to welcome Dr. Sean Fullan to Mercy Clinic Pediatrics. Dr. Fullan is accepting new patients at this time. For appointments, please call 636-978-7902. We are very excited to add him to our team!