Look at the height on a Cinnamon and Saffron puppy. It's interesting to watch how the growth occurs either slow and steady or right out the gate.
Puppies played with me for 3 hours them crashed. They slept for almost as long as they played.
They were really into the play today. 
When they start crashing you know it is time to bring them downstairs for some serious zzzzs.
They are truly actively wrestling and playing.
Also check out the gallery on Saffron's blog.