Below are screenshots from my game (Xbox, all DLCs, fully updated). The first images of both the Toddler and Infant are the originals from my Library, inserted straight into CAS, unaffected by the bug; it doesn't seem to occur for premade Toddlers/Infants already saved to the Gallery.
The second images of both Sims are from a separate saved household, where I aged them down from Young Adult and Teen, back to Toddler and Infant in CAS. This time, their eyes were significantly altered, as well as their mouths ever so subtly, though you can't really tell unless you quickly swap between pictures.
Before-Bug ToddlerAfter-Bug ToddlerBefore-Bug InfantAfter-Bug InfantThe results are quite tame compared to other random Sims I've tried this on. Some have stretched eyelids, lips, and other facial oddities. I recommend others try it out on their own Sims.
