Need help creating/replacing sounds in my first ever mod

All I want to do is either replace or remove the baby crying sounds. I absolutely hate the new ones, I can't handle them.

I have never once modded a game in my life, I am super brand new to this. I'm hoping what I want to do is simple, and going through all the tutorials and such I don't know what complex information is relevant to what I want to do and what is meant for more complex mods. I have Studio and the TS4 Sound Tool, I just don't know where to begin, what kind of file a sound file even is, or how to go about modifying them. I'm hoping someone can give me some good starting points so I don't spend two days studying the wrong kind of files.

Side note: if anyone can help with finding the original baby sounds, that would be fantastic. I pretty much assume they're lost at this point though, now that everyone's games have updated.