Using baby sign language is a great way to help young children communicate their wants and needs before they are able to say them verbally. This often eliminates frustration because they are able to communicate with you through some modality.
You can start teaching your child baby sign language around 6-months of age by pairing a sign with a word. Every time you say the word out loud you will have to do the sign with it. Your child will quickly learn that that sign means the word you are saying. The goal is for them to start using the sign to request what they need or want.
Check out the videos below for common words to start with.