When does the embryo take on human characteristics?

The embryo begins to take on human characteristics during the first trimester of pregnancy, particularly around the 8th week of gestation. At this stage, it develops recognizable features such as limb buds, facial structures, and the beginnings of organ systems. By the end of the first trimester, the embryo is referred to as a fetus and exhibits more defined human traits, including the formation of fingers and toes, as well as facial features becoming more pronounced.