This humorously illustrated book explains consent in child-friendly terms, explaining bodily autonomy and choice through primarily nonsexual examples. It focuses on the importance of not forcing, bribing, or arguing someone into an activity that they are not interested in, helping children learn how to stand their own ground and respect other people's boundaries. Some of the examples it gives is that without consent, you can't shove someone into the pool, share embarrassing photos of them, or tickle them. Given that issues like these are very relevant to children's relationships with adults and each other, this approach helps kids understand guidelines for good behavior and grasp the concept of consent before they need to understand it in a sexual sense.
However, even though this book mostly focuses on the general idea of consent, it does specifically address some sexual issues. A side note about embarrassing photos mentions that taking or sending nude photos of anyone under eighteen is a crime, and the author explains near the end of the book that even though some families might not allow you to make your own choices about what you wear or which relatives you hug, if you are being hit or touched inappropriately by a relative, this is an issue that you need help and support to deal with. She makes it very clear that if you are touched inappropriately by any adult whatsoever, you should tell someone, and that the adult is always, exclusively responsible for this. However, she doesn't define what inappropriate touch is, and she doesn't address forced sexual touch between children, so it would take an attuned parent to explain this to their child and make sure that they fully understand the issue.
This book provides a list of resources in the back for children who have been harmed by inappropriate touch, and it also gives repeated emphasis on the importance of talking to trusted adults whenever anyone makes you uncomfortable for any reason or tries to force you to do something that you don't want to do. Overall, this is a good resource, and it is much more child-friendly than I expected, since it is discreet about sexual issues and does not assume a high level of awareness or interest in sexual relationships.
However, I wish that the author had made it clearer that just because you choose to do something with your body does not mean that it is wise or good. Even though this book is a solid resource on the importance of holding to your own and respecting others' boundaries, it gives the message that something is okay as long as you consent to it. This can seem to justify reckless and damaging behaviors just because it's "your body," and it can also confuse children about sexual contact with their peers. This book makes it extremely clear what consent is, and insists that it is okay to change your mind, even when it disappoints people, but it doesn't make it as clear as it should that just because you consent to something does not mean that it is healthy, wise, or good for you. To make sure that this message is clear, parents would need to read this with their children, supplementing the book's message with additional explanations and perspectives on their family's values.