I was about to post this:
The MaxRequestsPerChild directive sets the limit on the number of requests that an individual child server process will handle. After MaxRequestsPerChild requests, the child process will die. If MaxRequestsPerChild is 0, then the process will never expire.
Till I saw your other reply lol...
Not sure how it'll work with 0, I think it'll just keep the apache proces alive all the time vs killing it; so if you spawn too many child processes they'll all remain, which could actually be bad...