When is a good time to start teaching my child sign language?

My son is almost 7 months old and I intend on teaching my son sign language. My husband and I both had hearing problems and we just want to give him a way to communicate with us if he has the same problems. Any suggestions on teaching and when to begin? .

Can anyone give me information on learning sign language?

I’m looking for some websites or books that people have had positive results with in learning sign language. I took some classes when I was younger and still remember most of it, but I would like to learn more. Money is tight, so I’m hoping to find some free resources if possible. .