Many thanks, guys! He's actually about as laid-back as he can possibly be, that's been a surprise and a relief. Hardly ever fusses except when there is something actually bugging him (hunger, discomfort, scared, etc). Mainly it's been feeling cold or uncomfortable during changes or baths, and surprising himself in his sleep with the "startle" reflex, and thus waking up. I think I got seven hours of sleep last night (in three chunks -- 1 hour, 3 hours, 3 hours), which is just crazy for having a 6-day-old baby in the house. Pretty cool.