I think anything you can do to help your baby communicate with you to let you know their needs, the better. We didn't do signing with our kids, but that's just because we didn't hear of it. My neice is learning at daycare, and it's helped because she doesn't talk clearly yet. She's 2, but still doesn't communicate well enough to be understood. If she signs "more drink" we know what she wants, and it helps eliminate some of her frustration about not being understood, and lessens the number of tantrums because she didn't get what she wanted.
