Thumb Sucker

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My one year old has been sucking her thumb for a few months now. She only does it when she’s asleep at night and at nap time. Recently, her thumb has started looking like this. How do I get her thumb to heal and her to stop sucking on it?

Yes, I know she’s one and with such limited sucking it isn’t a huge issue but her thumb looks painful and I don’t want it to become worse.