I agree with M R.
It seems that just when they've lost the oblong goofy shape of their head from a vaginal birth, they are not exactly photogenic for other reasons... baby acne is so common.
I am not sure if it was the 'cure' of my baby's acne, or if it just ran its course, but, I would take a baby washcloth (they are way more gentle and softer on baby's skin than adult washcloths) and would wet it with warm water, and wipe baby's face a couple times a day. My Italian baby's have always seemed to have excessively oily skin, like mom and dad :) I didn't use any soaps or washes, just a wet washcloth twice a day. my last baby also seemed to be getting cradle cap in her eyebrows... probably because i never touched those with the brush. Which leads me to my next tip... brush baby's hair twice a day with a gentle baby brush to help exfoliate skin cells and prevent cradle cap... don't forget a quick swipe on the eye brows :)
Baaby acne can last a while, but it can also be gone quickly... either way, like M R said... it's not a health concern.
Congrats on the birth of your new baby girl, and tell your son congrats on being a BIG BROTHER! yahoo!