I might be overthinking this.
But LO is 16 weeks old. We have been sleep training her this week - she was ready. Took two moderately fussy nights of crying (longest was an hour after a few checks but each, she slept 8-9 hours after falling asleep) and last night she went right down and slept 10 hours.

Anyway, I feel like we have a few issues approaching - possibly the 4 month sleep regression, as well as teething (she is drooling buckets and constant hands in mouth).

Do you let them CIO during these issues? Or do you have to revert to more coddling/rocking type stuff? Obviously with teething there could be a fever and she'd want comfort, but otherwise, what? Re-train after the tooth cuts or the regression passes? Or solidify the sleep training by continuing as usual?