Dilemma! 5 month old waking in early morning and babbling!!

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My 5 month DD had been sleeping through since 8 weeks - typically from 7pm - 7am. For the last week or so, she's been waking several times during the night and babbling very loudly - sometimes it almost sounds as though she's crying although I know it's more like a 'loud grizzle'. When I go through to see her, I just pop the dummy in her mouth which settles her and she goes back to sleep. My concern is that she's going to expect either my husband or myself to keep getting up and doing this in order to re-settle herself. Please could someone give me their opinion as to what they think I should do as I really don't want to start a trend here. Should we leave her or should we always go in? We have left her on the odd occasion but it went on for a good while so we had to go into see her.
We'd appreciate any advise.

Welcome to my world!! Ds is 6 months, and we still have him in our room because it's less hassle than going into his room to see to him! He sleeps from 8pm usually, but is restless, and wakes in the early hours.We're trying to cut out the night feeds now...sometimes the dummy works, other times he comes in our bed, other times only milk will sort him.Is it possible that your dd is either teething or hungry? if she's started on food, has it given her tummy ache? Ds has terrible wind if he eats fruit, which wakes him up. I am a bit worried about his dummy, like you. But I know that he can go to sleep in the buggy without it, so he's not 100% reliant on it. And loads of people say he'll just grow out of it.

Thanks Ixel. She has started on solids - having 2 a day - and then only has 4 bottles. I was actually wondering whether it could be hunger that's been waking her but ruled that out when I saw her re-settling herself when we put the dummy in. Maybe I should try and give her a late feed tonight and see how we go.
She's also been drooling like crazy as well as pulling her ears and sticking her hands in her mouth all the time (chewing on them). I'm therefore also not sure if those little 'toothypegs' may be on their way.

DS has been chewing and dribbling since day one! We tried late feeds to help sleep, but it doesn't seem to make much difference either way. Some people swear by a dream feed, butit didn't work for us, as ds woke up totally and wanted a whole bottle again, and then a chat!!

ds2 also has this habit of waking for quite long periods and 'cooing' to himself. He's doing it fairly regularly now in the early hours (5-6am), often after I've fed him but sometimes just randomly on and off. This seems very strange behaviour to me after my first, who would NEVER be awake and content in his cot like that- either asleep or screaming!
My policy is to leave well alone if he's not actually crying. He will generally go back to sleep by himself, and I think this is brilliant