Children's Mercy Wichita Mass vaccine clinic is for ages 5 -11yrs. Dec. 3rd - Dose #1: 1-4 P.M . Vaccines at Children's Mercy Appointments are needed. Walk-ins are not available. How to schedule an appointment: If you have an account already, log into the Children's Mercy Patient Portal If you do not have a Patient Portal account, call the COVID-19 Scheduling Hotline: (816) 302-6300 We are ....