Everything You Need to Know to Have a Healthy Twin PregnancyBy: Gila Leiter, Rachel Kranz Twins triplets quads finally! The book that answers all your questions about multiple birth written by a doctor who is a mother of twins herself Over ten years ago when Dr. Gila Leiter, herself an OB GYN,was pregnant with twins, the book she desperately needed wasn'tavailable. Now it is: Everything You Need to Know to Have a Healthy Twin Pregnancy. Taking you step by step through the processes of pregnancy and birth, Dr.