Stages of development, from an ovum & spermatozoon to a newborn Rumi, July 16, 2008July 16, 2008 The following information is approximate. Every pregnancy is different. Development varies from fetus to fetus. Do not rely on this information for medical decisions. The process leading up to the birth of a newborn baby can be divided into many steps: About 1 month before conception: Almost all… Continue Reading