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none
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zygote turns into blastocyst and travels down fallopian tubes
rapid cell division starts
blastocyst implants itself into uterus lining during week 4 and becomes an embryo -
neural tube closes
heart,organs and bones start to develop
develops head/trunk
brain starts to develop -
brain and face shape begin growing
four-chamber heart
all major organs have formed
lips and nose have formed
trunk/neck begin to straighten -
all body parts are present
eyes, ears,arms and legs are identifiable
head is half the size of the body -
genitals develop
teeth buds form
baby is 2 inches long and weighs 1/3 of an ounce -
fingernails grow
face is more defined
intestines are in the abdomen -
baby's sex becomes apparent
baby can swallow/make urine -
baby is moving, mom can't feel it
baby is 4 1/2 inches long
weighs 4 ounces -
baby begins to hear
digestive system works
vernix caseosa covers the baby -
regular sleep/wake patterns
breathing movements occur but are underdeveloped
covered in Lanugo
all organs/structures formed -
has nails,fingerprints,eyebrows,lashes and possibly some hair
lowest limit of viability outside of mother
heartbeat heard with a stethoscope -
wrinkly skin, translucent and pinkish red
lung development
8 inches long
1 1/3 pounds -
eyes partially open/close
nervous system directs breathing and body temperature
baby kicks/stretches -
finished most major development
rapid weight gain
lanugo starts to fall off -
responds to light
continues to grow fingernails and toenails
skin is pink/smooth
4 1/2 pounds -
takes up most of amniotic sac
starts to turn head down for labor
will continue to gain 1/2 pound until week of delivery -
brain,lungs and liver still developing
brain will double in size between weeks 35-40
weight gain helps with temperature control after birth
lung development during the last few weeks helps to decrease complications after birth