Nursing Student
New Grad

05.02 Fetal Development

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  1. Three stages
    1. Preembryonic
    2. Embryonic
    3. Fetal

Nursing Points


  1. A developing human being is referred to as an embryo from weeks  2-8, and is a fetus from 8 weeks – birth
  2. By end of embryonic phase, most organs are formed (not functional necessarily, but formed)
    1. Head takes up half the body
    2. Heart is pumping


  1. Pre-embryonic
    1. First 2 weeks after fertilization
    2. Free floating ball of cells making its way to the uterus
    3. This stage ends with implantation
  2. Embryonic
    1. 2 weeks – 8 weeks after conception
    2. Heartbeat present, circulation begins
    3. Heartbeat seen on transvaginal U/S around 6 weeks
    4. All major brain structures in place
    5. Bone begins to replace cartilage
    6. Embryo is approximately 1.2 inches long
  3. Fetal
    1. 8 weeks to birth
    2. Circulatory system and all organs present
    3. Heartbeat able to be heard on external U/S at around 12 weeks
    4. Fetus able to hear at 18 weeks
    5. Able to open and close eyes at 28 weeks
    6. Lungs continue to develop and more alveoli form → completed around 35 weeks
      1. Fetus does practice breaths
      2. Placenta does gas exchange

Therapeutic Management

  1. Medications
    1. Full list of patient medications to ensure they are safe during pregnancy
  2. Prenatal vitamins

Nursing Concepts

  1. Reproduction
  2. Human Development

Patient Education

  1. Medications
  2. No alcohol
  3. Prenatal vitamin

Reference Links

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Video Transcript

In this lesson I will explain the development of the fetus in the various stages so you will be aware of what is occurring at each phase.

There are three phases when we are talking about fetal development. The first is preembryonic and this is the first 2 weeks after fertilization. There is a free floating ball of cells making its way to the uterus for implantation. When implantation occurs we have the embryonic stage. This is week 2 to 8. The last stage is fetal. The fetal stage is 8 weeks until birth.

Let’s now break these stages down to some more detail. So first is the preembryonic stage. This is the first 2 weeks after fertilization so 0-2 weeks of life. Fertilization occurs and there is a free floating ball of cells making its way to the uterus for implantation. This stage ends with implantation.

Next is the embryonic stage. This is week 2 to week 8. Conception has occurred and a heartbeat is present The heartbeat is heard and visualized on a transvaginal ultrasound around 6 weeks All the major brain structures in place. The embryo is approximately 1.2 inches long. So it’s about the size of an olive.

Our last stage is the fetal stage which is 8 weeks to birth. The circulatory system and all organs are present. The heartbeat is able to be heard on external ultrasound at around 12 weeks. The fetus is able to hear at 18 weeks and can open and close eyes at 28 weeks. The lungs continue to develop and more alveoli form. This is completed around 35 weeks. The fetus does do some practice breaths in utero but no gas exchange occurs in the lungs it happen by way of the placenta.

Therapeutic management at this point in the pregnancy is not a lot but we need to ensure that any medications that the patient takes are safe since she is conceiving. She needs to be taking prenatal vitamins to ensure proper nutrition for proper development. Education at this point will revolve around safe medications, no alcohol, and ensuring they take prenatal vitamins.

Reproduction and human development are the concepts for this patient because fetal development starts with reproduction and then fetal development is the process of human development.
Ok so to review everything and wrap it up there are three stages in fetal development. Preembryonic is first. It starts with fertilization of the ovum. Once fertilized it becomes a zygote. Cell division occurs and now it becomes a blastocyst. Remember a blastocyst is a ball of cells. This ball of cells travels to the uterus. Next is embryonic. This begins with implantation in the uterus and now early development will occur. This stage of development is from 2 weeks to 8 weeks. The last stage is the fetal stage. This occurs at 8 weeks to delivery. This is the final stage so all organ development and growth will occur.

Make sure you check out the resources attached to this lesson and review the time frame of each stage as well as what is occuring in each stage. Now, go out and be your best selves today. And, as always, happy nursing.

  • Question 1 of 10

A nurse is instructing a pregnant client about the dangers of drinking alcohol during pregnancy. Which information most likely characterizes fetal alcohol syndrome (FAS)?

  • Question 2 of 10

A nurse is performing a newborn assessment on a baby born at 28 weeks. Which assessment findings should the nurse expect? Select all that apply.

  • Question 3 of 10

The nurse caring for a newborn diagnosed with patent ductus arteriosus explains to the client’s parents that the ductus arteriosus is an opening between which of the following?

  • Question 4 of 10

A nurse is teaching a student nurse about fertilization of an ovum. The nursing student demonstrates proper understanding if he/she lists the site of fertilization as what?

  • Question 5 of 10

A nurse is explaining fetal gas exchange to a nursing student. Which of the following statements indicate the teaching was understood?

  • Question 6 of 10

A nurse is educating student nurses on the process of implantation and fertilization. The students understood the teaching if they identify the most common site of fertilization as which location?

  • Question 7 of 10

During the first trimester screening the ultrasound tech is checking for the site of placental implantation. The nurse knows that which part of the uterus is the normal site of placental implantation?

  • Question 8 of 10

A nurse receives a call from an 8-week pregnant client. The client reports that she got an at home Doppler to listen to her baby’s heart rate and wants to know when she will be able hear it. The nurse tells the client that an external doppler can begin to detect the heart rate around how many weeks’ gestation?

  • Question 9 of 10

A nurse is educating a group of pregnant clients on the risks of taking ibuprofen during pregnancy. A client asks why the fetus has holes in its heart. What is the most appropriate explanation of the purpose for the ductus arteriosus?

  • Question 10 of 10

A nurse is teaching pregnant clients about the risks of preterm labor. At what gestation are fetal lungs are thought to be mature enough to function outside the womb without support?

Module 0 – OB Course Introduction

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