Chapter 4 Prenatal Development Michael Hoerger

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

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

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

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