Communication with babies can often be difficult. They can’t tell you with specificity what is bothering them. So as parents, we come up with a working knowledge of each cry and scream, decoding the various tones and volumes and hypothesizing about what their needs are. The earlier we can communicate with them and have them communicate back, the better. That is why I am so thankful for baby sign language.
I am not an expert with sign language. But I have used it successfully with our FOUR babies at early stages. I wrote Simple Effective Baby Sign Language where I shared the most basic and most necessary baby signs. If you are just starting out with baby sign language, I would start there with the most basic baby signs.