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In kittens you can see wool suckers or cotton suckers. It is not common but does occur. Kittens will seek out the material and nurse on it non stop. This is similar to a child sucking their thumb. Most kittens will outgrow it on their own. The main concern is ingestion of strings from the material which can cause a blockage. I would discourage the behavior when you see it and give her attention to distract her. Hopefully as she gets older she will lose interest in the behavior but I have seen it last in cats up to a year of age.
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