I'm a first time mom so new at all this 🤔🤔🤔 doctor said don't wet or clean the umbilical cord and…

I'm a first time mom so new at all this 🤔🤔🤔 doctor said don't wet or clean the umbilical cord and it'll fall on it's own... So it fell off yesterday can I clean his belly button or do I have to wait still ??