Gehana's baby acne issue made me think I should share a great piece of software I use when retouching headshots and baby skin. I imagine I'd use it if I shot seniors or brides as well.
It's called Portrait Professional. I know lots of you have probably heard of Portraiture, but I find that portraiture creates really plastic looking results. Portrait Professional creates very natural looking skin when used the right way. You can create plastic too....if that's what you're going for. I use it for every single headshot client.
You can also do some interesting facial modification, though I never use that function. It's pretty funny sometimes to see what the program thinks a person should look like.
I've got the most advanced version that works as a plug in with Lightroom....but I think the stand alone JPEG only version is about $40.
Link: http://www.portraitprofessional.com/ ignore the terrible examples on their website. I don't know why they think that's what people want to do. It's so good a natural result. These over done edits are terrible.