Hi
My 8.5 monther was a premie, and is definately not a big baby, however he's waking up heaps each night at the mo too.
I'm no expert at this parenting thing, but my wee guy isn't hungry (he's been sleeping thru consistantly before this phase) and isn't in discomfort and I'm mystified. I made a posting last week about it, and it's not got any better. I was awake from 11-3 last night. PUPD does work, just takes a while and you definately need to be consistant and kind of remove yourself from the situation emotionally to get thru the crying bit.
Anyway, don't have any answers, but just wanted to say 'you're not alone' and I think we do just have to ride it out. Maybe it's just a developmental thing. Hard work tho, eh!!!