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Chapter 4

Chapter 4. Prenatal Development. Michael Hoerger. Phases of Pregnancy. Germinal: up to 2 weeks, 60% death rate Embryo: up to 8 weeks, 20% death rate Fetus: up to birth (28 weeks), 5% death rate 3 months, 3 ounces, 3 inches, all organs Only 1/3 zygotes survive to birth. Teratogens.

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Chapter 4

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  1. Chapter 4 Prenatal Development Michael Hoerger

  2. Phases of Pregnancy • Germinal: up to 2 weeks, 60% death rate • Embryo: up to 8 weeks, 20% death rate • Fetus: up to birth (28 weeks), 5% death rate • 3 months, 3 ounces, 3 inches, all organs • Only 1/3 zygotes survive to birth

  3. Teratogens • Definition: substance increasing risk for prenatal abnormalities • Critical periods: time when organ or body part is most susceptible • Interaction effects • Caution is best

  4. Birth Complications • Apgar scale: 7 out of 10 is OK • Sleeper effects • Washout effects • Perinatal Anoxia • Increased inattention throughout life • Infancy: Sensory and motor difficulties • Age 3: Cognitive deficits • Age 7: Social skill deficits

  5. Michael Hoerger To cite this textbook: • Berger, K. (2005). The developing person through the lifespan. New York: Worth. To cite this lecture: • Hoerger, M. (2007, January 22). Developmental Psychology: Prenatal Development. Presented at a PSY 220 lecture at Central Michigan University.

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