It looks like a graphics glitch to me. I've got a good graphics card and great detail on my Sims, and on my infant, it looks like orangy patches. It's not attractive, for sure, but if it goes away at the toddler stage, I can handle it. And they do need much more care now. Before, when only a couple of interactions would satify hunger and social needs, now it takes up to 5 or 6 interactions.