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PRENATAL DEVELOPMENT (infant behavior: reflexes are responses that are…
PRENATAL DEVELOPMENT
infant behavior
: reflexes are responses that are inborn and do not have to be learned
rooting
sucking
crying
grasping
course of prenatal development
266 days ish,
3 trimesters
periods
germinal
first 2 weeks
sperm
fertilizes egg
zygote
implantation
blastocyst attaches to form embryo
occurs 10-14 days after conception
embryonic
2-8 weeks after implantation
life-support systems for the embryo develop
amnion
: fluid filled protection sack
umbilical cord
: connects the baby to placenta
placenta
: nutrient tissue, filters waste
organs begin to form
heart first
lungs last
fetal
2 months after conception
viability
: able to survive outside womb
6-7 months
teratogens
: agents that can cause harm to developing fetus
agents
drugs & alcohol
environmental pollutants/chemicals
viruses & diseases
severity & type affected by
dosage
genotypic susceptibility
timing of exposure
infant perception: habituation & gaze
habituation
: decreased responsiveness to repeated stimulus
research tells us
whether a baby remembers
whether a baby can distinguish b/t two stimuli
indicators
gaze duration
sucking rate
heart rate