Races/Nude Bodies
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Mods
Female Child Nude Patch (Vanilla Races)
https://mega.nz/#!NUgWxKQT!la5UzwA2OPgnmjrnWSB_e8MlOhL-ZSLN6aq7ogGWZxA
A simple nude patch for the vanilla female children. By trvsbckl.
[WARNING]: This will affect the male children as well, because they share the same textures. You need to install the mod "Children Extended" to fix this (see the next entry).
Children Extended - Separated Meshes and Textures for each Gender and Race
http://www.nexusmods.com/fallout4/mods/7519/?
A framework mod that separates the body files for male and female children, allowing you to have a nude replacer for each one (so you don't get girls penises or boy pussies).
As a precaution against a future "Nexus takedown", a mirror of the above file can be found here (version 1):
https://mega.nz/#!IBgiXQqB!GNov-7QbIcXPs18YjtjeQZzZsMJTOqa8TmMY_sDqfR8
Playable Children
http://www.nexusmods.com/fallout4/mods/583/?
A very basic (but functional) playable child races mod. See the above link for more details, and be sure to fully read the description on the mod's page!
Common Children - Body Patches
https://allthefallen.moe/index.php?/topic/3326-common-children-updated-05212016/
Nude body replacers for both male and female children respectively. By Elwin.
Children's Hair Conversion
https://allthefallen.moe/index.php?/topic/3302-childrens-hair-conversion-updated-4232016
Converts the adult hairstyles so that they work with the child races (both male and female hairs). By Elwin.
REQUIRES this mod to be installed first - overwrite the files with the above!
Nude Shota Body (CBBE)
https://allthefallen.moe/index.php?/topic/4520-cbbe-shota-body
A custom made CBBE-based shota body for the boys. By NudeModLover and Ulithium_Dragon.