Configuration help required

Hi All,
I am new to apache.My requirement is to launch a one active child
process.This process will handle all the request with multi threads in
it.Below I have given the configuration.The MPM model i am following
is worker and the OS is Sun 5.9.

Configuration
ServerLimit 1
StartServers 1
MaxClient 25
MaxSpareThreads 25
MinSpareThreads 1
ThreadsPerChild 25
MaxRequestPerChild 0

The issue I am getting is that once the webserver runs for a day or so
Apache is launching one more daemon.This I am not clear how it
launches one more daemon even when I kept the SeverLimit as 1.Also is
it because of the over load it is launching one more daemon?Is it
better to keep the MAxRequestPerChild as non-zero?
Looking forward for suggestion and help..
Thanks in advance.
-A