Final answer:
An IUFD at 19 weeks is classified as a second trimester loss. During the fetal stage, substantial development occurs, including the formation of recognizable human features and the maturation of organ systems.
Step-by-step explanation:
An IUFD, or intrauterine fetal demise, at 19 weeks would be classified as a second trimester loss. A fetus is defined as the developing human from approximately nine weeks after fertilization until birth. During the fetal stage, significant developments occur.
Development Between Weeks 9 and 15
- By week 9, the embryo is referred to as a fetus and starts to take on more recognizable human features.
- The fetal tail begins to disappear as it develops further.
- Organ systems continue to develop and mature.
Changes During Weeks 16 Through 26
- The fetus undergoes rapid growth and refinement of bodily systems.
- Structures such as the lungs begin to develop more fully, though not enough to support life outside the womb without medical intervention before about 25 weeks.
- External features such as fingernails, eyebrows, and eyelashes appear.