To what does Hamnet compare the buboes forming on Judith's body in the novel, Hamnet?

Hamnet compares the buboes forming on Judith's body first to quail eggs, which are petite. As the plague develops, Judith's buboes grow in size and severity. When Hamnet next observes the lumps after attempting to fetch the physician, he compares them to a hen's eggs, which are significantly larger than quail eggs.