We have an 8 month old, who after a rough first few months has been sleeping relatively well for about 4 months now. She consistently sleeps 12 hours at night, and has a regular day time nap schedule, and bedtime schedule. She's generally quiet/calm during the day, and only really gets upset if she is late for a nap for some reason. She usually falls to sleep after about 5 minutes of wind-down in the crib. She has eaten before going to sleep her entire life.
Lately, the past 2-3 weeks, she has been crying for about 2 hours about 20-30 minutes after going to sleep. She seems to drift to sleep and wake back up. At first we thought teething, but the timing seems off as two bottom front teeth came through without much crying already, and now it starts after when no others seem to be starting. She had some possible light blood in her night-drool about 3 weeks ago, which we suspected the teething, but hasn't had it in a couple weeks now. We tried the dr's ibuprofen, which seemed to help her fall asleep immediately but she still woke crying.
The cry is generally different than her former cry, as it very loud and screeching, like she is in pain. If we let her cry she does eventually cry back to sleep, but it has been taking hours. The times we've checked on her with some rocking, it didn't do much of anything for her, nor does it help her sleep if she's returned to the crib.
Curious of any thoughts what this could be or approaches to figuring out solutions? Evenings have been rough again here.