Fixes the character generator bug where the three mouth parts all were being combined into one mouth.
Before Fix
After fix

This is a simple workaround fix until an official fix will be released. I didn't make a propper variation file to provide a true kid preview but it's rather a female adult's mouth as a placeholder.
Instructions
Go to your RPG Maker MV program folder, then go into
Generator\Face\Kid
Delete the THREE FGMouth files. Replace with these TWO files.
https://www.dropbox.com/s/54rfpeak9xi8m7y/FG_Mouth_p00_c1_m001.png?dl=0
https://www.dropbox.com/s/ece93ile7x39hct/FG_Mouth_p01_c1_m001.png?dl=0
Make sure that you're saving the full images, not previews! Do NOT rename them!
Next, go back to the Generator folder and go to
Variation\Kid
Save this there.
https://www.dropbox.com/s/skaqemmc11xxch0/icon_Mouth_p01.png?dl=0
Make sure that you're saving the full image, not a preview! Do NOT rename it!
FAQ
Q: Everything in the kid tab has become transparent/I don't see any parts
A: Verify that you don't have the third FG mouth anywhere. Make sure you have both icon_Mouth_p00 and icon_Mouth_p01 in your variation folder.
Q: Where do I find my generator parts?
A: For Steam, it's under your Steam folder and then
SteamApps/common/RPG Maker MV/ Generator
Other installations
Assuming you used default settings, otherwise replace program files with the path you installed the program to.
32-bit systems
Program Files\Kadokawa\RPGMV\Generator
64-bit systems
Program Files(x86)\Kadokawa\RPGMV\Generator