The book discusses embryology at a high level and any practitioner reading this book would need to be up to date with their biological knowledge of the embryo in the very early stages of pregnancy. The combination of scientific language, the minimal use of pictures, a lack of glossary (including abbreviations) and the length of each chapter means that it can be difficult to follow. Added to this, the large amount of discussion that is dedicated to all placental animals and not just humans means that this book struggles to hold the interest of the reader for long periods.