What is the developing infant from eighth week after conception until birth?

Fetus

The developing infant from the eighth week after conception until birth is called a fetus. The fetus grows rapidly during this time, and its organs and body systems continue to develop. By the end of the fetal period, the fetus is fully formed and ready to be born.

Some of the key developments that occur during the fetal period include:

* The formation of the major organs and body systems. By the end of the eighth week of development, all of the major organs and body systems have begun to form. These include the heart, lungs, brain, kidneys, liver, and digestive system.

* Rapid growth. The fetus grows rapidly during the fetal period. By the end of the third trimester, the fetus weighs about 6-8 pounds and is about 20 inches long.

* Increased movement. The fetus begins to move more actively during the fetal period. By the end of the third trimester, the fetus can kick, punch, and turn its head.

* Development of the senses. The fetus's senses begin to develop during the fetal period. By the end of the third trimester, the fetus can see, hear, smell, and taste.

* Preparation for birth. The fetus's body begins to prepare for birth during the fetal period. The lungs mature, and the fetus begins to produce vernix caseosa, a waxy substance that helps to protect the skin from the amniotic fluid.

The fetal period is a time of rapid growth and development. By the end of this period, the fetus is fully formed and ready to be born.