Until 6 days ago dd2 had been sleeping through (7-7 without waking) for about 4 weeks. This included two weeks while we were on holiday, where after one rocky bedtime she settled back to not waking at all, despite loud tantrumming from her big sister (3) on occasion. Since we've got home, she's woken every night, usually at around 2. I thought at first she was resettling after the long flight and being away from home, and didn't want to reinforce the night waking by doing too much cuddling or soothing. I particularly didn't want to start feeding her at night again, which I had been doing until a month ago.
So, I responded in a modifed cc kind of way--going in to her every now and again (about every 15 minutes though not watching the clock), moving her if she had got herself into a really uncomfortable position in her cot, and going out again. I confidently expected that we'd see quick improvements, as CC worked wonders with dd1 for night waking at 7 months, and when I decided to stop feeding dd2 at night the first time round she was sleeping through after only 2 nights. But instead, she's cried for 30-80 minutes every night, and there's been no improvement at all. Last night I so wanted to get back to sleep that I fed her after 45 minutes crying after which she slept like an angel until 7.45 am.
Now I don't know what to do. Although I've occasionally picked her up, I really think I've been pretty hardnosed with the CC (until last night!) which makes me wonder why it hasn't worked. Maybe she is really getting hungry at night. That does seem odd, though, considering that she hadn't needed milk at night for several weeks. Do they have growth spurts at this age? Another possibilitythough perhaps this one is far-fetchedis that on holiday she had got used to sharing a room with dd1, and finds it harder to put herself back to sleep now she's in a separate room again. The irony of that is that the only reason she's on her own now is because I don't want her to disturb dd1 at night. In the long run we want them to share a room.
In all other ways she is an excellent sleeper--has good naps, and settles herself well at bedtimes. Should I persist with the CC (which I know will now be set back because of feeding her last night), or go back to night feedings for a while (how long)? I don't mind feeding her at night but I don't want her to end up with a night-waking habit that's more difficult to break than it is now.
Sorry this is so long.