It's hard to tell quite what's wrong with this picture at first. Then you notice the little girl is holding a dead mouse. The baby is vomiting.
I'm actually fairly impressed with this collection of French illustrated children's books: it makes a change from all the wishy-washy-Shirley-Hughesy stuff I remember from our kid's learning to read with the aid of pictures stage. And yes, there is a book called 'my first nightmare' in there.