DH and both have two door cars and now we have a newborn. We used the sticky film on the side back windows and it's not great but I guess it does the job of blocking the sun. However, there's a lot of sun the comes in the back window. I've been looking around and I don't see anyone using a sunshade on the back window. I'm thinking it's not legal. What can I do to keep the sun and heat off DD? I live in Vegas so it gets real hot here. TIA!