If you don't mind, I'm going to tag on another question to your post because we're in the same boat and I'm wondering if DS's recent bad nights are partially due to teething. Here's my question to the ladies who can offer any words of wisdom - if it's teething, would picking LO up and rocking him make the teething pain feel better? To me, if he calms down instantly after I pick him up (and then cries again as soon as we put him down), that doesn't say teething. It says sleep regression/separation anxiety; whereas, if it was teething, wouldn't it take a pacifier or something else to suck/chew on to sooth that pain (which DS won't take when he's really upset in the middle of the night) even if you still picked him up?
Thanks, OP, for asking this question and TIA for any insights!