No there isn't anything wrong with it. In fact it is actually beneficial for kids to grow up in a naturist (nude) family. The benefits are not only limited to a better concept of the body image but also have proven to show a lower rate of teen pregnancy and other problems. Countries were nudism is more common have a much lower rate of sexual assault than does countries that are more prudish.
Now that being said, these benefits are only realized fully when they not only grow up being nude regularly but also seeing their parents and siblings nude. You'll also find many benefits if you try it. More relaxed, sleeping better, less laundry to wash, etc.
Check out the link below to an 18 year study on the effects of kids growing up in a naturist environment.
Good luck

