How to suspend another process before it executes main

Question

In Windows, I can use the C++ interface IWbemObjectSink to monitor the launch of a process. I can know a target process is launched in the virtual function Indicate(...), and I suspend the target process immediately when it is launched. But I find the target process has executed something before it is suspended.

How can I suspend the target process before it executes its main()?

Thanks a lot!

I expect a good way to suspend the target process before it executes its main().