S.H.
When your baby does that, ie: fuss, cry, make little noises, in between her sleeping... don't swoop in right away to interrupt that. Let her be... see if she will go back to sleep by herself.
It could be that she is learning and is on the cusp of going back to sleep by herself and self-soothing, because she is doing this in her sleep.
Babies make all kinds of sounds as they sleep. It's okay. It's normal. Not every noise warrants us to go in and "wake" them to do something to intervene.
Try letting her be, and see if she will just go back to sleep herself. If she self-soothes and goes back to slumber, then great!
Both my children have done this. Even now, at 5 years old my girl makes some sounds during the night, but it is while she is asleep and its fine. My son, who is 20 months, does this too. But they don't actually wake up and cry...it's just transient noises. They are perfectly able to sleep through it. Even we adults make noises when we sleep. LOL.
Just see. Unless she is really distressed or crying full throttle or is hungry, or something is really wrong, I would just let it be and see if she goes back to sleep. No need for a pacifier if she doesn't notice it with or without.
Also, at growth-spurt times ( at typically 3 mos., 6 mos., 9 mos., 12 mos. etc.), they change and go through transitions and sometimes get hungrier. They are growing and developing cognitively too. It's normal. But if she's sleeping fine and it's not bothering her, then let her sleep.
Good luck, hope this helps,
~Susan
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