This is a unique, much-needed full-color atlas-textbook on twinning and multiple pregnancy. It features nearly 300 beautiful, original color plates, covers in great detail material that has never previously been synthesized into a coherent whole, and is based on the very latest advances in knowledge about the biology and pathology of twins and higher order multiple pregnancies. Special sections deal with the lives of twins and their parents, how to examine twin and HOMP placentas, how to photograph twins for medical purposes, and how to test twin zygosity. The authors are among the world's foremost specialists in the field, widely renowned for their leadership and expertise.