Development
prenatal development:
Germinal stage:
36hrs
mother fallopian tube
cell implant
placents
embroynic stage:
2 week-8week
structures visible
i inch
fetal stage
9week: Brain formation
12 week: Smile and frown
16 week : Heartbeat strong mother feels movement
20 week: Hiccups begin hair form
24 : Visual and auditory senses , functional ,eyes open
28 fat is added
32: Sleep and wake fulness
36: Rapid increase in weight and gain immunity
38: Birth

factors :
Internal environment
in a womb
mothers state of mind
mother' s nutrition
illness of mother
aids
mothers drug intake
fetal alchol syndrome
birth complications
teratogens
mercury ( mental retarditon)
caffeine ( miscarriage)
radition ( higher incidene of cancer)
rubella (blindness.deafness ,heart defect)