I’m really confused, please help me! Child is 4 years old and I’ve been researching today and I’m really overwhelmed looking at all products. There’s leap reader, leap pad. What the difference? Also on amazon there’s books for leap pad but comments they don’t fit! I have no idea and feeling overwhelmed. Customer service was rubbish they basically told me to look on website which I have been doing! Please someone explain to a non-techs person like me about these products.