My 7 month old daughter won't stay asleep at night. For the last 2 months (or longer, I can't remember when it started) she wakes up after about 40 minutes crying and won't settle to sleep again. Either my husband or I will go in and, until a week ago she would fall asleep again in 5-10 minutes, then 40 minutes later we would repeat this pattern until 11 or 12, then she would be out until 6:30 or 7 in the morning. This last week she won't settle after the 10 minutes and it is taking upwards of 2 hours to get her back to sleep. And she has added in a 4am waking that can be 20 minutes, or 2 hours. Her naps in the day are normally an hour and a half.
We have had the same bedtime routine since she was 6 weeks old - Supper, playing on a blanket on the floor, bath, massage, and breastfeed to sleep (I know, I shouldn't be doing it, but it was working to have her sleep 10 hours + from 6 weeks on). When she wakes I don't feed her again, just shush and pat. Bedtime is usually around 7pm and she falls asleep very quickly.
6 weeks ago she got her first tooth. This is the only one so far.
Any suggestions? The cry isn't a mantra cry, it is a come help me cry.