if the back windows aren't already tinted, get them tinted. Especially if the youngster is going to be in the back seat. A roasted child is a terrible thing.
If you do decide to get the windows tinted, don't go cheap on it or you'll have ugly, bubbly windows. Spend the extra to have it done right. I had the Altima's windows done 8 years ago; while the tint has faded a bit, there are no bubbles. The difference for people travelling in the back has been well worth the cost.