Major Milestones Flashcards
Implantation 6-8 days after ovulation
blastocyst is free floating
week 1
greatest vulnerability to teratogens
week 1-8
blood cells and blood vessels begin to form
heart is beating
by 3rd week
neural tube formed by open
4 weeks
eye formation
4-5 weeks
heart fully develops
end of embryonic period
end of 8 weeks
fetal heartbeat heard with ultrasound doppler
10-12 weeks
sex is apparent
end of 12 weeks
amniotic fluid is adequate amount for amniocentesis
16 weeks (or as early as 14 weeks)
face has human appearance
lanugo apparent
end of 16 weeks
quickening
18-20 weeks
baby’s weight is 600g
end of 24 weeks
body is lean, well proportioned
vernix and lanugo present
reflex hand grasp functions
end of 24 weeks
surfactant forming on alveolar surfaces
end of 28 weeks
weak suck reflex
brown fat being deposited for thermoregulation after birth
end of 28 weeks
lungs developed (gas exchange)
if born at this time, can breathe
end of 28 weeks
sense of taste, sound
male testes descend to scrotum
bones fully developed
end of 32 weeks
LS 2:1
about 35 weeks
skin pink, body rounded
less wrinkled; lanugo shedding
end of 36 weeks
lanugo present upper arms, shoulders
vernix decreased
fingernails beyond fingertips
sole (plantar) creases run down to heel
male testes in scrotum
female labia majors well developed
end of 40 weeks
