I'm not familiar with too many coding things for kids, short of scratch from MIT. Though that's far from bad; it does a REALLY excellent job of introducing basic concepts that will carry into actual coding.

That being said, the most important thing you can do is make sure the projects your kid works on are FUN and REWARDING. Don't start them out on anything important, until it's important to them. For example, my brother made a simple, flash computer game for me when he was 9-12 (I forget exactly). That was his first introduction to working with tech, and now he's working towards his PhD in AI tech.

Best of luck to you and your child!