What age do children start signing back?
We are not a Deaf family, nor do we have any Deaf members of our family, but I started learning ASL when one of my child care kids was Deaf. When my next baby was born, my husband and I started signing basics: mommy, daddy, hungry, eat, ball, tired, etc. My daughter signed mommy and eat when she was 9 months old. The rest took a lot longer for us, but I imagine that babies learn faster and easier if ASL is the main language used or, at least, if someone puts in more effort than we did.