It was likely that. It can be caused by several things, including in utero
exposure to various contagions, insufficient blood supply during or prior
to birth, or a number of other causes covered by wikipedia entry. It may
not be fatal, especially when it presents at an older age (over 6 weeks),
but this litter didn't make it. One by one their symptoms got worse, and
they couldn't keep down food. When it became apparent that they weren't
going to recover, we had them humanely euthanized.
it could be ''cerebellar hypoplasia'' that is when you dont have the
balance you should have they could have born with it or get it later it
isnt affective to others but it goes away or not (thats nature) it's not
deadly they will be fine but you have to pay good attention