My daughter is not even 12 weeks old but when she is 6 months old, I want to sign up for Mommy'n'Me-type swim classes. When she's a toddler, I intend to have her in some toddler-friendly activities. But as soon as she's 4 years old, I plan to have her in something more structured (an instument, a sport, etc.) and long-term.

I started swimming lessons when I was 3 years old and started piano lessons when I was 6.

What have you enrolled your LOs in? How old were/are they?