It's comforting for this cat which is cute but being weaned too early (which means being removed from your mother's feeding and her breast too early) can lead to this kind of insecure behaviour. I've seen it in a cat I fostered and you see it not too infrequently on the Internet.
It may be one reason why Siamese cats are predisposed to sucking wool. Cats who have been early weaned will suck items of clothing or parts of the anatomy of their owner. The lanolin in wool smells like the mother's breast. I don't think there is much that can be done about it because the "damage" has been done.
You might be able to alleviate it through plenty of tender loving care and creating a very secure environment. The cat should not be punished and in my view the owner should put up with it and let their cat do this because if not the cat may take from that human behaviour an understanding that they are being rejected. In other words it might undermine the bond between human and cat.
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Cat weaned too early sleeps with owner's finger in his mouth. Screenshot. |