So what are the rules? There are none. Our state doesn't specify an age. I'm chewing this one over, making my little pro/con list. So far, the only thing in the 'con' column is that he sure seems kinda young. Looking back, I worked as a mother's helper the summer I turned 10. The following year I started babysitting in earnest.
If I ask myself (WWMDD) what Mama Duggar would do, I can totally justify this. The jury is still out on my decision though.