The phrase "quick with child" is an old-fashioned term that means being pregnant. While this expression may be uncommon in modern times, there are plenty of synonyms you can use to describe someone who is pregnant. Some examples include "expecting," "carrying a child," "in the family way," "preggers," "in the pudding club," "with a bun in the oven," "up the duff," "heavy with child," and "great with child," among others. These and other terms can be used to describe a pregnant woman without using the archaic phrase "quick with child".