When to start reading Potter to little ones?

[Katie]

Hey All,

I am interested in everyone's opinion. I have a 4 year old and a 2 year 
old and one on the way. The kids know all about HP from me, because 
they see me reading it all the time, though we do not watch the movies 
because I don't let them watch TV. Neither of them has expressed 
particular interest in having me read HP to them, although they like to 
have me tell them the basic story and talk about it. They know I love 
it, so they take some joy in sharing it with me. I am beginning to 
wonder if it's time to start reading SS to my 4 year old? We have done 
some chapter type books, reading one chapter each day, so he has the 
patience...I just wonder if it's a little beyond him. 

He's the type of kid that would be very frustrated if he couldn't 
understand it. I don't want to start reading it to him, have him get 
frustrated, and have my own child not like HP!! That would break my 
heart! What do you guys think? 

Katie