Why does RSE need to be developmentally apropriate in schools?

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Across
  1. 4. What does RSE stand for?
  2. 6. In what curriculum is RSE compulsory from the age of three?
Down
  1. 1. What is the new focus in the RSE curriculum?
  2. 2. What has helped parents talk to children about pants and whats in their pants?
  3. 3. In the welsh government report what are primary school deemed as?
  4. 5. Who wrote children, sexuality and sexualisation?