Phases of Prenatal Development

Phases of Prenatal Development

The development of the fetus during prenatal development can be separated into certain phases. Commonly, the phases that occur during a woman’s pregnancy are discussed as trimesters, which segment the pregnancy into three phases. However, an alternative way of discussing the phases of a pregnancy is based on what is occurring in fetal development. These are called the germinal, embryonic, and fetal phases.

Trimesters

A typical, healthy pregnancy lasting 40 weeks consists of three phases referred to as trimesters. Trimesters are the most commonly discussed breakdown of phases in a pregnancy. Trimesters are three approximately equal segments of time during pregnancy. This is a useful grouping of time periods, typically referred to by gestational age, because each trimester seems to hold its own distinctive symptoms, risks, and developmental progression. The first trimester (weeks 1–12) begins the development of all of the major organs (including the sex organs), the spinal cord, the placenta, and the umbilical cord. At the end of the first trimester, the nerves and muscles begin functioning and the eyelids close over the eyes. The second trimester (weeks 13–28) progresses through the formation of the skeleton and skin. More physical detail develops, including fingernails, eyelashes, eyebrows, fingerprints, and a covering of fine hairs all over the body. By the end of the second trimester, the baby can swallow, hear, and sleep. In the beginning few weeks of the third trimester (weeks 29–40), the baby moves around quite a bit and works to store important nutrients and body fat. As the third trimester comes to a close, the baby may reposition with its head down to prepare for birth (Womenshealth.gov, 2010a). See Table 4.1 for a more detailed description of these core fetal developments during each trimester (by gestational age).

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