I don't think it works that way, Pinky :)
Fetal development was a week behind. So I'd think that even though they have been out of the womb for 7 weeks, their bodies are still at the equivalent of six weeks of a normal birthed puppy. Of course, I could be wrong. Still, why the rush? It's not unhealthy for them to stay at mum and sibs a week longer. And might even help out in the long run :)
Another story problem for the doggy math quiz--- the mind boggles ;) :D