Signing is a fantastic thing to do with children. I work daily with speech pathologist and they all say it is a wonderful tool if partnered with speech. So when you sign "more", or whatever other word you are signing, say the word with the motion. There is a book called Baby Signs and we used it with our child. We had less behavior issues with him and one of the reasons I believe is because we gave him the tools to communicate. He also talked sooner than the other two kiddos. We started around 8 months, I know people who started earlier than that and it was fine also. Good Luck and happy signing! Wait until they do their first at you, you will be really excited!