The first steps of human development—those that occur within the first few weeks of pregnancy—remain mysterious in many ways. Within a week of fertilization, human embryos form a blastocyst, which ...

Scientists have created a stem cell-derived model of the human embryo in the lab by reprogramming human stem cells. The breakthrough could help research into genetic disorders and in understanding why ...

Sigmund Freud developed a five-stage model of human development, each stage with its own characteristics and challenges. Not only was this a useful way of viewing our growth, but he believed that ...

Assistant Professor of Obstetrics and Gynecology, School of Medicine, University of Washington Embryonic development, also known as embryogenesis, is a cornerstone in understanding the origins of life ...

Reviewed by Steven Gans, MD Key Takeaways Between the ages of 18 months and 3 years, children begin to express a greater need ...