Aggression in puppies

I doubt he is actually being "aggressive" - puppies, esp. labs, are mouthy and well, they bite. they bark, growl, talk and yelp too. remember that a lot of noise is him communicating with you.

If you need to pick him up, make sure you are supporting him well and just do so. You can give a little tiny treat if you like.

A puppy that is mouthy and moody at 6 weeks is like an infant that cries, it is NORMAL.

Start teaching bite inhibition (read the stickies under the first time owners section), reward good behavior and redirect from bad behavior. Don't punish a growl, listen to what he is telling you.

You do have a long road ahead of you in some ways, as a lab puppy (like most puppies and maybe more so) is a TON of work. A puppy and a baby will be even more work. If you are ready to give up a 6 week old puppy for acting like a puppy, then you should be reading all you can now and really looking for a trainer for once your puppy is old enough to join a puppy class etc. Read up on socialization, until the pup gets all his shots you can carry him places to see the world.

It's pretty common to read posts from people who are frustrated and stressed! You're not alone!

You already know 6 weeks was too early to leave mama. What this means is the little guy is missing out on learning puppy manners and bite inhibition from mama and siblings. So, you have to take care of this!

Very young puppies like this are not really "aggressive". BUT, they do have a lot of behaviors that people can misinterpret as aggression. In reality, it's a puppy that hasn't learned manners yet.

Growling is the only way dogs can communicate with us, since they don't have words to use. Growling can let you know something hurt them, or they are scared or uncomfortable. Once, when petting one of my dogs, she growled as I pet her "arm pit" area. When I checked it out, she had a pretty bad scratch that wasn't in plain sight. Growling can also let you know something makes them uncomfortable.
Then, there's also the play growl, you will learn the difference as you get to know your puppy better.

Puppies bite and snap as a form of play, it's how they explore their world. It's kind of like the way a toddler puts everything in their mouth. Check out the sticky "The Bite Stops Here." It's great! A word of advice: be super consistent, and don't give up. Many people think teaching a puppy not to bite all the time should happen quicker. So, they give up on one method and try something else. All that does is confuse the puppy. Remember, you're not just trying to stop the biting on that one occasion, you're trying to teach something that will stay with the puppy for the rest of his life. So, keep doing the same thing every time he bites.
Basically, when the pup bites, you make a noise, like a yelp, or saying OUCH loudly, but not angrily. Whatever you choose, stick with the same noise hereafter. The noise is to let the puppy know you didn't like it. The pup will probably go right back to biting, as it's what they do. Make the noise again, but this time leave the room for 20-30 seconds.
This is what you would do EVERY time. Yes, it's a hassle to leave the room all the time, but it will work.

Good luck!