My almost 18 month old has been waking like a newborn for the last week or so, since she was sick with a bad cold and cough. Prior to that she was up at least once a night to nurse, but she was easy to get back to sleep and the visit was pretty brief. We did mild CIO at around 11 months for falling asleep, and that worked well and she is still putting herself to sleep.

Just looking for some insight and ideas from others. A few things I'm wrestling with...

Is this the 18 month regression? Is night weaning worth it to see if it helps? I don't want to go through the trouble and then have lost the best tool I have to get LO back to sleep in the middle of the night. Does CIO even work on a toddler of this age, if we wanted to try it again?