J., if you ever figure out how to stop any one from interrupting, Patent it and make a fortune.
Right now you have one child and you notice he interupts and you think he understands that he isn't suppose to do that. What about the grown people that do it all the time? I have a sister that i talk to on the phone and her 75 yr old husband interrupts her over and over and over again. In a 30 minute conversation, he interrupts her 10 to 15 time!!
Is he interrupting you just to get your attention back to him or is he wanting to tell you something he thinks is real important. His important is different that our important!
He has no one else to talk to if you and your husband are having a coversation. If he is standing there or starts to say something what do you do? Can he get a word in edgewise or is your conversation non stop? Do you see what i am getting at. When you are on the phone if he says anything he is interrupting because you are on the phone. If you have a friend over and you are conversing, you will have him interrupt.
If you say to wait a minute and you finish your sentence or conversation with in 10 seconds and he gets to say something, then what happens? He isn't interrupting to interrupt, he wants to be part of the conversation. He is advanced in his verbal skills and he is going to talk non stop from awaking to sleeping and it doesn't make any difference if you are talking to someone else or not. When he is about 6 or 7 at the rate he is going he will be able to carry on a conversation with your friend as well as you do.
So, the problem isn't the interruption, it is that he isn't included in what is going on and he is trying to be. So, when you are having conversations with dad, friend,on the phone, you need to have him engaged in some activity that he loves to do so his attention is not on you. TV, toys, books etc will do the job. But you have to say to him that you are going to be busy with dad for a while and he needs to go do bla bla bla.
Now if you had (and i know you are trying - have you considered adoption?) 2 or 3 kids, then you will see what interruption really is. One kid hits the other one and she come screaming to where you and and interrupts what ever you are doing. One kid gets a toy that the other one wants and they both come screaming about it. Even with you one child, say he is watching a video and it ends. He is going to interrupt you to either put in another one or tell you he wants to do such and such. That is an interruption.
Giving him his turn is great, but he needs another turn as soon as you have said anything and again when dad or the friend says anything. He wants to be part of that conversation so he isn't interrupting, he is contributing!!
Like I said, grown people interrupt for the same reason. Donnie wants to participate in my sisters call when we talk and you can't stop it.
Good luck to you on a second child. You might think about adopting one that is between the age of 1 and 3. They are harder to place than babies so you have a better chance of getting one. I had surgery when our natural son was 4 yrs old but when he was 11 we adopted a 21month old and when they were 15 and 6 we adopted a 3 1/2 year old. So I can attest to the fact that you will love that child as much as your own. Good luck to you.
Marciab