Leaps and bounds, I'd say. When I look at photos taken two weeks ago, he was just a little "pinky" about the size of the first joint of my thumb but today, he's over four inches long and not that pink any more.
In fact, his fur should start to come in soon as his skin is changing colour and there is a black ring around his muzzle.His entire head is quite black, in fact. Given the plethora of black squirrels in Centretown, Oscar is probably one them. There are gray squirrels frolicking in the trees behind my house so there's an off-chance that he may have gray fur.
This is like waiting to tell if it's a boy or a girl.