Well I have a son who is a month and a half old and I want to teach him to sign so that he can better communicate his needs to me before he even learns to speak. My questions are when should I start to teach him and what resources are out there for baby sign language?

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Depending on the size of your library, you can probably find a lot of books and DVDs on baby signs. If you find one that you really like, you could then buy a copy.
You might look on Amazon.com, too. You will find reviews of books there, so you'll get a sense of whether other people thought that they were helpful before you choose one. You might find good quality used books and DVDs on Amazon and on eBay.
You should start using the signs as you're talking to him now. Maybe focus on the simple words for now.
As he starts to gain more control over his arms and hands, you can start helping him make the signs as you talk, too.
What a great way to help your baby communicate! So fun, too!