I don't mean with a little sucky dealibob from the chemist, I mean with your mouth.
I know some people do.
I am feeling so sorry for ds at the moment, he is so snotty and struggling to feed. I was tempted to try it last night but didn't as I didn't know if it could be dangerous (visions of accidentally sucking my baby's lungs up through his nose, or depriving him of oxygen or something).