Prefolds too big?

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I bought infant/smallest sized prefolds and tried one recently with my 6lb 9oz daughter. Did a couple folds but they were huge on her! Using a very small all in one now and continuing to mix with disposables but they are also a bit big. Is this common with prefolds and do I just have to wait until she's bigger to use them, or are there any tricks to getting a good fit on a small newborn? They swallow her right now...