Figured I'd post this in here since it's sort of a beginners question. I've been reading about possible issues related to this problem, but I still can't figure out what's going on with my beer. Right now I have two beers in bottle, a cream stout and a holiday ale. The holiday ale has been in bottle for about 4 weeks now and the stout has been in bottle for 2 weeks today. The ale pours with a little head if I pour it rather aggressively, and the head disappears very quickly. The stout pours with negligible head no matter how I pour it. I've noticed that the ale has a head when I pour one warm for some reason.. I'll preempt the inevitable first question and say that there has never been any rinse agent in contact with my bottles or my beer glasses. Any advice is appreciated.