Puppies do grow and develop quickly. Have you ever seen a puppy grow in only a couple of minutes?
A dog basically goes from a baby to an adult in one year's time - which is equivalent to almost 18 years of human life. After that, their growth slows down, but the first 6 months are amazing.
I found this very sweet video. This owner took a photo of their dog every day from the time he was 6 weeks old until he turned 6 months old, and turned it into a 2-minute video! It is very cute!
Check out how quickly this pup grows!