I taught my daughter about 100 words of ASL (English with and ASL lexicon, to be honest about it). Turned out super useful since she was a late talker (my second child, who I also tried to teach ASL was an early talker and thought ASL was stupid).
In my opinion, it's mostly useful because it's super cute. Typically kids who can sign 'milk' or 'more' can also indicate with grunts, grabs and reaching what the problem is. But it's super cute.
Turned out super useful since she was a late talker
That might not be a coincidence. There's some evidence that kids who use sign language tend to talk later. Maybe because there's less incentive to verbalize. It's not a language delay, though.
In my opinion, it's mostly useful because it's super cute. Typically kids who can sign 'milk' or 'more' can also indicate with grunts, grabs and reaching what the problem is. But it's super cute.