In this book the authors present current research in the study of foetal development and its stages of growth, maternal influences and potential complications. Topics discussed in this compilation include the equine foetal development, fetomaternal interaction and potential complications during pregnancy; comparative anatomy, development and functional significance of the mammalian yolk sac; influence of exercise training on e-NOS expression, nitric oxide production and mitochondrial function in the human placenta; maternal melamine and foetal development; and immunolocalisation of syntaxin2 in sinusoidal endothelial cells during mouse liver development.