With each week of pregnancy, your baby-to-be is developing in leaps and bounds. In the early stages, they are called a zygote. They then progress to an embryo, fetus, and finally, baby. You might ...

Before 8 weeks of gestation, the embryo will be very small. A person may not see or notice it. After 10 weeks, the embryo becomes a fetus and will be larger.

Human embryo replicas have gotten more complex. Here’s what you need to know. The lab-engineered models give scientists a look at human development beyond the first week ...