Gila Leiter is an associate clinical professor of obstetrics, gynecology, and reproductive science at Mount Sinai in New York. She is the author of Everything You Need to Know to Have a Healthy Twin Pregnancy: From Pregnancy Through Labor and Delivery . . . A Doctor's Step-by-Step Guide for Parents for Twins, Triplets, Quads, and More! Rachel Kranz is a fiction and nonfiction writer who lives in New York City. Her most recent novel is Leaps of Faith.