Hi, first a thing to put at the back of your mind over this, is that Dudley More, at the age of 6 was not only getting erections but masturbating,
OK so far then, so at 9 he's ok and try not to worry to much about it, if you keep looking and bringing it up, then he will think that there is something wrong with him, as for the facts of life, if you are going to start then do it very slowly, try and add it anything you are talking about with, any realations getting pregnant, or seeing women pregnant, is a good time to get him to ask questions about them and how they got that way, see be friendly about it, dont make it sound bad thing, if he starts masturbating dont start saying stop and you'll go blind, I think like most of our mums, just live with it, or you could ruin his sex life for ever.
But please dont tease him over it, or scold him.
Good Luck
It takes an expert to explain sex to children in non-embarrassing way.However, you may take it lightly , explaining that it is a normal growth process. I wonder whether we can teach him deep slow abdominal breathing. This does calm a person's sexual urge.It is likely that he might be already masturbating.It would be better if we do not scold children on this act.A tactful handling is needed.
Tell him he is not weird that it is just part of growing up. I am surprised that he waited until he was 9 years old. I was having erections around 7 or maybe earlier, I am just glad erections was explained to me as part of growing up.
When hormones kick in I don't think 9 is too early to explain what happens to the body.
on another forum you said he was your nephew I asked how you knew , and does his parents know ??
Well, I would have to say that it is much too soon to be giving your child, "The Talk". As for the erections part, that is quite amazing for a child to hit puberty at that young of an age, I think the best thing to do is either get it check out to know first hand that it's healthy and if it is have a sit down with your child to tell him that it is a normal part of growing up and to embrace it rather than be embarrassed by it.
Hope I could help with my answer