English Bulldog Behavior problems with kids

Question
Boris ,he is been acting aggressive with kids lately ,he knock down my 8 year old boy twice and my 12 year old girl once. He wont bite but pin them down and growls very aggressive . I try to correct him by hold him down too or hitting him after a few times he did it and he kind snap out of it and act like he is sorry about it.

Answer
If you keep hitting your Bulldog, he's going to bite one of your children.  Since we're higher on the evolutionary scale than is the dog, we must use our brains to interact with it.

I have no idea how old your Bulldog is, what kind of breeding he's the product of, what sort of veterinary care he's received and whether or not he's neutered.  I strongly suggest you hire a credentialed behaviorist to teach you how to interact with your dog in an appropriate manner.  Until then, he should never be left alone with your children for any reason and I suggest you put him on long house tab (long cotton web training leash) so that you can easily extricate him from interaction with them while you are in the room and observe something in his behavior that you don't like.  Also, take him to the veterinarian for a neurological workup and if he isn't neutered, do it ASAP.