My DD is just over 6 months old and was starting to sleep up to 9 consecutive hours at night.
Then about 3 weeks ago it started to change.
Firstly she woke at 3am for a feed for a few nights (I'm still BFing). Then that moved to 4:30 am. Now these last few nights she has been up 3 times a night.
She goes down at 9 pm, then is up at about 1am, 4am and 7am and is generally up for the day at 8.
I feed her and that generally gets her back to sleep, though once or twice she has been up and lively for a couple of hours.
Generally she doesn't cry when she wakes, she is noisy though and takes the feed.
At the moment we are co-sleeping, we're just getting her room set up to move her into her cot bed. We did try getting her in a crib, but she never really took to it so we stuck with the co-sleeping.
Also her 2 bottom front teeth are just coming through. Mostly this seems to cause her pain during the day and we've been giving her Dentinox, teething granuals or Neurofen on the occasions when it seems v painful to her.
We're also weaning her. Started with 1 meal a day at 5 months, now on 2 meals a day and about to introduce the 3rd.