Colleen,
Lab are great dogs and can make good family pets. However the shelters are full of Labs and Lab mixs. Mostly because people get them as pups thinking they are going to be this great calm pet that loves everyone. Labs are very smart and need from day one lots of training and things to do.
The post from Marc is very good, Labs are bred to find prey or hunt. Is your pup a male or female? And how old is your son? Do you use a creat? Is not that would be a good thing to start doing. Start train now, have your son help and teach him how. Is your pup got a collar on ? He should be under your control at all times. No ruff house play from your son with the pup.
Is this dog going to be a working dog or a family pet. If a pet the bite should be met with in less than 30 sec. and he should think he is going to die, then put him in his creat and refuse to give him any attention for about 30 min.
Labs are sweet and can be good dogs, Lab pups until they are about 2 can be a hand full if left not worked with.
The pup like all dogs is picking up on your sons fear and the game at this point is a game to the pup. Have you son help you with every point of care, training, cleaning up after ect.. of this pup.
But no biting allowed not even in play if you are just wanting a pet.

I think it's unrealistic to expect a 9wk. old puppy not to mouth, giving it "he thinks he's is going to die " corrections at that age is bad advice, under any circumstance. A level 10 correction at that age could do serious damage,Jeeez. The dog isn't biting, it's mouthing, it's normal behaviour, if the children are that afraid, maybe the dog is not a good fit in that home, JMO, AL

I have 2 young kids, 4 and 6. I have raised a few puppies around them. The easiest way that I have found to introduce kids and dogs is the following. Granted this is my own opinion.

1. Crate train the dog.
2. Always have the dog on a leash ATTACHED TO YOUR BELT when the dog is out of the crate for at least the first few months.
3. Teach the dog to sit when being petted by the kids.
4. Don't let the kids feed the puppy until the puppy knows to sit before he will get his food bowl.
5. Play with the puppy as much as possible before the kids want to come into contact with the puppy. So pull the puppy out of the crate and play with him for 10 minutes until the puppy is clearly gotten out most of his play energy. Then when he is ready to settle down a bit have the kids come over and talk calmly to the dog while petting it calmly.

If you kids don't know HOW to pet a puppy (nicely) then use a stuffed animal to practice on.

Just some suggestions...

She is female. The first female dog I have had on my own. She is in a harness at all times and on two different leashes during the day. Shorter for inside and longer for out. I am crate training her and I have never done that before. It has been 13 or so years since I have owned a dog. This is my first Lab. Ive only had GS. She will be somewhere in between working and pet. Were not hunters but we camp and fish quite a bit. Today has been a better day for my son. In fairness to the dog. I am giving him (my son) 2 more weeks to see a huge improvement. So that way if I need to find her another owner she will still be a young pup and on the road to good training. Its only been a week and she sits and stays on command. So I am encouraged about that. The breed was a big decision. My brother has a high strung hyper Lab. He only listens to my brother and that dog is not allowed anywhere near my kids. I'm on it. This pup is already 2 feet long and 17inches at the head. Her dad is 115lbs and thin. So I no I need to be in control now. Thanks for the help <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

Thats some gooooooooood advice. Especially the pre-playing with the pup. Thanks Much <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />

The harness might be part of the problem as well. I would get her a flat collar to attach the leash to. That way you can give a good correction for nipping or chasing.

Hey Marc, Your right and my friend raises pugs. Can't stand the ugly little things. She is way meaner than I would ever be. The female from day on has peed all over her house and she crate trains. Her male peed for one day and then got the message. So, what I think Im getting out of all the posts ( especially for the Labs) is to be firm, loving and re evaluate the situation for everyone concerned on a daily basis and give it a little time she is only a pup. But, not too long. Children first over any animal. <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />

Hi Colleen
Think it sounds like you are doing a good job. Lab puppies can be very hyper but with good training they are usually turn out to be really nice dogs. Wanted to clearify what I said about the biting and what to do. It sounds like you know enough to know the difference between a bite and mouthing. The only time the correction that I sugguested would be for a all out bite. I have been bitten by 9 week old pups that meant to bite, one a mix breed and the other was an Irish Shetter. Both turned out to be highly aggresive dogs, both very smart and both ended up being good dogs. They needed a lot of hands on work.
Just wanted to make sure I was being clear, labs are normally a bit mouthy,they will pick up just about anything.