Question: how much weight should my labrador puppy gain each week?
Answer: Many 'average' Labrador puppies weigh just over two pounds for each week of age. So at around three months such a puppy might weigh 25lbs, and at six months they'll reach 50lbs. But this kind of rule of thumb is of limited use, and there are problems with judging whether or not a puppy is thriving by his weight alone.