in most cases is to go ahead and get them started on it.
I showed some interest in music early on and got put into private lessons and performances at an exceptionally young age (well before six).
It turned out that I did have quite a bit of innate musical talent and I reaped a lot of benefits and accomplishments with it growing up. I wasn't quite a Julliard prodigy, but I was performing with the advanced high school groups by eighth grade and college symphonic orchestras by my junior year in HS.
The problem, however, is that once my parents got me that invested into music, there was no escape hatch and and no realistic means to ever try out anything else. By my mid- to late-teenage years I was burned out by it and a little bitter that it was used as an excuse for why I never got any support to try other activities like sports.
So, in short, potentially a great thing to identify and cultivate a kid's interests and talents early on, but one should be cautious to only let it become as consuming as the kid wants it to be.