Depending on the mother's immune system she will either pass on a little or a lot of immunity to Parvo. If it is a lot, it will interfere with the first set of immunizations. And as her passed on immunity declines in the puppy, there is a "window of susceptibility" in the puppy between...
I am praying your puppy makes it!! I am in the same boat as you , but mine has hemorrhgic gastroenteritis. He is in the hospital also.. Very very stressful time. Please Lord, let these puppies be okay!!!!