How is it priced?
Whats the dress code?
Here's another thread, in which I listed some of the prices at Scarpetta. I think it is pricey, but not too much so, and it is worth it.
The night I dined there I did see children there - happily eating spaghetti with tomato and basil - so yes, they can go.
Dress can be casual, many dress a notch or two better.