Our baby slept through from ten weeks to eight months (with the exception of the odd night when teething).
We hit 8.5 months and it's all gone wrong. She is easy to put down (though doesn't self settle), but she wakes every two hours completely wired, and takes ages to get back to sleep. I'm back to work now and so I need her to sleep. I know what she is like teething and it definitely isn't that. Weaning is going well so I don't think she is hungry. She has started to crawl and pull herself up, and has just started at nursery.
If you had this, how long did it last? Will she go back to the great sleeper she used to be? I'm open to sleep training but I see mixed advice about whether to do this or not.