Is there such thing as 6 month sleep regression? Good sleeper turned bad!

[Jemimapuddleduk]

Hi,
My dd has always been a fairly good sleeper. From a month or so she would wake once or twice a night for a bf (generally after midnight) then go back down till 7ish. From around 4 months she was down to 1 wake up at 4ish and then when we started solids she slept through for around 3 weeks. It's now all changed! She has started waking at 11ish and won't settle just with dummy- it took an hour, DH trying to settle with a bottle of water and me giving in to a bf last night to settle her. She then woke again at 3 with a similar pattern then up for the day at 6.30. It seems that she has forgotten how to sleep for stretches longer than 3 or 4 hours!
What I want to know is if this is normal? What can we try to help her to sleep longer and self settle. Is controlled crying an option- any advice in this. I am not 100% happy with that idea but similarly do not want to be feeding several times a night and camping out on nursery floor like last night!
Thanks

Contrary to what everyone one tells you, solids can make them wake more for two reasons. Firstly, their digestive systems are getting used to food and this can keep them awake. Secondly if they eat to many solids in replace of milk, they wake hungry. Solids full them up but aren't calorific at this age.

A last reason is allergies. These kept DS awake for months on end once we started weaning but less likely.