What happened to the Muggleborns 11 and under in 1997?

Given that during that year both the Ministry and Hogwarts were under control of the Death Eaters and pursuing virulently anti-Muggleborn policies, what were the repercussions for the Muggleborns who were at that point too young to attend Hogwarts, but whose names would have already been written by the magic quill in Hogwarts, and hence in the hands of the Death Eaters running the show?

Specifically, what happened to those too young to receive letters or know about magic/Hogwarts in 1997? And what about those who were supposed to be attending first year that year?