K.F.
I use to take my daughter to Mercy Pediatrics located in the St. John's medical building, but I was not happy with the care provided. I now take my daughter to St. Louis Pediatric Associates. Dr. McKinney is great with her. There are also 8 other drs. there. They have office hours on sat. Here is the link you can read about the doctors. http://www.stlpeds.com/ouroffice.shtml
Also if you can have you baby anywhere else besides the baby factory (St. John's) I would. I am one of the horror stories and will never have a baby there again. In fact I wouldn't let my dog have babies there either.