They are essentially extra swatches, and won't replace anything. The contacts can be found in the Face Paint section, and the Non-Defaults can be found with the other eye colours. Your package has a ton of baby skins in it, including old ones, you need to delete them so they dont override your skin replacements. If you choose default replacements, please make sure that you don't have any other default replacement eye files in your mods folder, or they will conflict and you won't be able to change your sims eyes. Default replacements, non-defaults or contacts.It’ll take a bit of upfront work on your part but creator Martine has left helpful instructions on how to customize your babies. These eyes have been up for a while on my Simblr, but I forgot to upload them here, so here they are for anybody who may like them! You can swap between 3 different skin tones, 22 different hairstyles, 6 eye colors (with options to change the color even further), 3 types of freckles, extra baby clothes, and accessories.
UPDATE - Now fixed for infants! - Also fixed Vampire eyes being strange and floating on other ages: redownload the replacements file and download the extra file for infants if you'd like it!