D.B.
I agree with the nurse on the heart rate bit. Babies do seem to have very fast heart beats, and I didn't expect that. I'd take it for a full minute and see how fast it really is. And in my experience, you have to "teach" your kids to fall asleep. By 12/13 months, if I went in to try and put her back to sleep, she'd never go completely back to sleep because she'd be anticipating me leaving her. But if I left her to go to sleep on her own, she'd cry herself to sleep. It took a while at the beginning (I started letting her fall asleep on her own during nap time when it was light outside) to fall asleep on her own, but as she's gotten a little older and done it more, she does it just fine really quickly. If she wakes in the night, it usually only takes her about 5 minutes to get back to sleep. If not, I know it's something more.
If she's waking up and it's a relatively new thing she's doing, she could be teething or maybe she's experiencing bad dreams. My kids sometimes seem to wake up for that reason. If the bottle helps sometimes, it could be because she's relieving the pain in her gums that way (if she's teething). I mention teething because usually if my daughter (or son, when he was that age) wakes up regularly it's usually because of that. ANd if it doesn't seem to be that, it never hurts to call the pedi - that's what they are there for.