Chapter 4Chapter 4Prenatal DevelopmentPrenatal Development

Michael Hoerger

Phases of PregnancyPhases of Pregnancy

Germinal: up to 2 weeks, 60% death rateGerminal: up to 2 weeks, 60% death rate Embryo: up to 8 weeks, 20% death rateEmbryo: up to 8 weeks, 20% death rate Fetus: up to birth (28 weeks), 5% death Fetus: up to birth (28 weeks), 5% death

raterate

3 months, 3 ounces, 3 inches, all organs3 months, 3 ounces, 3 inches, all organs Only 1/3 zygotes survive to birthOnly 1/3 zygotes survive to birth

TeratogensTeratogens

Definition: substance increasing risk Definition: substance increasing risk for prenatal abnormalitiesfor prenatal abnormalities

Critical periods: time when organ or Critical periods: time when organ or body part is most susceptiblebody part is most susceptible

Interaction effectsInteraction effects Caution is bestCaution is best

Birth ComplicationsBirth Complications

Apgar scale: 7 out of 10 is OKApgar scale: 7 out of 10 is OK Sleeper effectsSleeper effects Washout effectsWashout effects Perinatal AnoxiaPerinatal Anoxia

Increased inattention throughout lifeIncreased inattention throughout life Infancy: Sensory and motor difficultiesInfancy: Sensory and motor difficulties Age 3: Cognitive deficitsAge 3: Cognitive deficits Age 7: Social skill deficitsAge 7: Social skill deficits

Michael HoergerMichael Hoerger

To cite this textbook:To cite this textbook: Berger, K. (2005). Berger, K. (2005). The developing The developing

person through the lifespanperson through the lifespan. New . New York: Worth.York: Worth.

To cite this lecture:To cite this lecture: Hoerger, M. (2007, January 22). Hoerger, M. (2007, January 22).

Developmental Psychology: Prenatal Developmental Psychology: Prenatal DevelopmentDevelopment. Presented at a PSY 220 . Presented at a PSY 220 lecture at Central Michigan University.lecture at Central Michigan University.