Fetal Development Stages and Key Milestones in Prenatal Periods
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61 Terms
What is the Germinal Period duration?
0-2 weeks
What is the duration of the Embryonic Period?
2-8 weeks
What is the Fetal Period duration?
8 weeks to birth
When does the heart beat begin?
18-21 days (3 weeks)
When do arm buds appear?
4 weeks
When are eyes formed?
32 days
When is the upper lip formed?
38 days
When do brain waves start?
40 days
When do legs and arms develop?
44 days
When is the sex of the fetus determined?
7 weeks
When is embryo classified as fetus?
8 weeks
When does axon retraction occur?
8-9 weeks
random movements
8-9 weeks
When does the umbilical cord form?
8-9 weeks
When are fingers and toe joints visible?
8-9 weeks
When are internal organs visible?
8-9 weeks
When does trunk flexion and extension begin?
8-9 weeks
When are thalamus and hypothalamus formed?
8-9 weeks
When does breathing begin?
10-12 weeks
When do eyes develop?
10-12 weeks
When does the mouth open?
10-12 weeks
eyes can close
10-12 weeks
external ear develops
10-12 weeks
postural changes
10-12 weeks
legs shorter than arms
10-12 weeks
When do limb movements begin?
10-12 weeks
cries feels pain
84 days
ISOLATED random movements
10-12 weeks
reflexes active
13 weeks
When are fingerprints present?
14 weeks
When do slow eye movements develop?
13-18 weeks
When do taste buds form?
13-18 weeks
When do distinct movement patterns emerge?
13-18 weeks
arms cross midline
14 weeks
sucks thumb; hands together
16 weeks
When is skin covered by lanugo hair?
16 weeks
somersaults/ mother feels movement
16 weeks
suck reflex / swallowing
17 weeks
When does the fetus begin to hear and recognize the mother's voice?
20 weeks
When does initial myelination begin?
20-22 weeks
eye movements more rapid
20-22 weeks
When do hands open to explore?
20-22 weeks
thoracic expansion on breathing
20-22 weeks
isolated movements head/limb
20-22 weeks
When do facial expressions develop?
20-22 weeks
respond to stories, music, etc,.
22 weeks
1 lb
24 weeks
rods & cones present
25-28 weeks
all neurons of visual cortex present
25-28 weeks
pupillary light reflex
25-28 weeks
many primitive reflexes present
25-28 weeks
independent movements to all parts of body / uterine wall
26-32 weeks
1.5-2 lbs (685 g)
26 weeks
2lbs
28 weeks
practicing breathing
28 weeks
has dreams (sleeps 90% of the time)
30 weeks
Urinates
32 weeks
Head into pelvis
34 weeks
99% survival
36 weeks
Decreased movement
37-38 weeks
1000x original size
38 weeks
Note 
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