Children’s books are probably the biggest selling kind of book (second maybe to cook books if I remember correctly - or it could be the other way around). So if you want to quit your day job, maybe you could find some idea that’ll have the little buggers clamouring for more. But if this is your aim and ambition - to write the world’s best children’s book, then you perhaps should stear clear of these titles. They may not really help you to write that killer kids tale.