IRA for a child

I've heard this is a good way to set your kid up for success and take advantage of compounding. One of the parts I always get caught up on when looking into it, is that your kid needs some form of taxable income, and whatever they contribute, you can match it.

If you have a child that is just a couple years old, how do you accomplish this? I can't just say I pay her $3000 a year for picking a book to read each night..or can I?