Here is a more detailed timeline of a Labrador Retriever puppy's growth:
* Birth to 3 months: Lab puppies grow rapidly during this time period, doubling their birth weight by 2 weeks of age and quadrupling it by 4 weeks of age. They will continue to gain weight rapidly until they are about 3 months old, when they will start to slow down a bit.
* 3 to 6 months: During this time, Lab puppies will continue to grow steadily, but at a slower rate than they did in the first 3 months. They will also start to develop their adult features, such as their longer muzzle and larger paws.
* 6 to 12 months: Lab puppies will continue to grow steadily during this time period, but they will start to fill out and gain muscle mass. They will also reach their full height by around 12 months of age.
* 12 to 18 months: During this time, Lab puppies will continue to gain weight and muscle mass, but their growth will start to slow down. They will also start to develop their adult coat.
* 18 to 24 months: Lab puppies will reach their full adult size by around 24 months of age. However, they will continue to mature and gain muscle mass for several more months.
It is important to note that not all Labrador puppies will follow this timeline exactly. Some puppies may grow faster or slower than others, and some may reach their full height and weight earlier or later than 24 months of age. If you are concerned about your Labrador puppy's growth, talk to your veterinarian.