During the Nifty Knitting livestream we discovered a bug with one of the new child hairstyles (cfHair_SP17LocsLong) that had a selection of hair colours that are not available to children. This is a bug specific to only that hairstyle and will be fixed in a future patch. Child hairs are not created with all of the adult hair colours and there are currently no plans to add more at this time. Having these additional colors available breaks the Create-A-Sim UI and can cause other issues. Sorry for any confusion.