Child Actors Grow Up To Be Parenting Book Authors?

Okay. So maybe I've been living under a rock. But, I just discovered (while trolling Amazon for free Kindle books) that Mayim Bialik is not the only child actress to write a book on parenting. Punky Brewster, aka Soleil Moon Frye also wrote a book on parenting (not that she has a degree in Neuroscience or anything else that I'm aware of)....hummmm....maybe I'll be looking into this too....not to say that I'll believe anything that a celeb puts my way, but it is interesting to see how/why they are raising their children--particularly because we all get to watch and see if it worked!