These will be the firsts. What do I mean by that? As these are the oldest, they will most likely open their eyes and ears first. They will be the ones that walk first...but then again maybe not.
Let's us see the difference in age. Cinnamons are 11 days old, Letis 7 and Raven's 1 day old.
This means there will be a 10 day delay in development between Cinnamon's and Raven's boy. But as they get older, they learn from the older pups and suddenly the differences fade as the youngest strive to keep up with the older. We have seen this happen time and time again. A 10 day delay is the max I would like in merging all the pups together. We will be doing that when the time is right. they will be walking and playing by then. There are many benefits in merging them. They learn from each other. they benefit greatly by essentially having not 1 but two adults mentoring them.
After that stage, we start slowly inviting the older dogs to play with them. But I am getting ahead of myself. Next is eyes and ears opening.