So, I was looking around on the internet, and basically, I want to be able to convert the Sims Medieval Baby cries to Sims 3. I am a beginner in Modding, and I found the file that is written like "Assign Actor "b2o_crib_cry.ma"."y" as "y"

And I for some way possible, I know it's possible, I just need to be guided in the correct direction. All the searches are for TSM to TS2/TS4, or TS3 to TSM. I need to be able to convert the animation files directly to re-code the game. I have found the files I need, I just need to be able to find the exact files but from TSM, and move it there, BUT I don't know where to look for it. I open the .package files from TSM in S3PE (seems to work right?) And now, the tricky part, being able to get an application to read the files so I could paste the cries from the Medieval game and replace the animation for what I have pasted at the top... Please help... Or I will probably be trying to figure it all by myself and probably ruin at least one or both of the games. It's NOT as terrible as I have made it sound, but I am over the Sims 3 demanding cries

As similar as the two games are, it's not quite a cut and paste sort of job to convert animations.

Babies in TSM are actually objects, in the way that TS1 and the original TS4 babies were. They're tied to the bassinet and animated as part of it, whereas the TS3 baby is its own actor interacting with a separate object (b2o).
Because of this, the rigs between the two may not be 1:1 compatible - but you can certainly experiment.

The tools you need are Blender 2.79, the Clip Tool plugin, and a rig (Andrew's rigs include baby).
Export the o_bassinet_loop_cry_bassinet CLIP from SASFullBuild1, open the buRig in Blender, and Load CLIP. It will likely require some manual re-adjustment, so those other animation tutorials may come in useful.